Wurlitzer Grand piano C173

[leunghb]

My son of 14 yr old just tried on a Wurlitzer Grand piano C173, 5'8'. Only one original owner, she said she has it for 12 yrs, serial # 074746, bought it new at around 16K. Hardly play, black colour. It didn't tune for the last 5 years. My son found the keys are especially heavy, sound tone is not acceptable right now; something wrong with the left pedal.
So my question is:
How much it worth now?
Is it fixable? How much to cost to fix at least?
My son doesn't like such heavy keys, would it possible to make it lighter? and how much would it cost ?
THanks a lot!

[leunghb]

Any inputs are really appreciated.

p.s. The current response of the piano keys are not good either. The seller asked for Canadian dollor 3995.

[indianajo]

12 Years old would be sold in 2002.  that would be after the sale of the Wurlitzer brand to a global corporation that uses the cachet of this fine old name to sell quite possibly second line or third line imports.  
The Wurlitzer factory in NY was shut down in 1988, according to wikipedia.
I played a Wurlitzer post shutdown console last year, it was a piece of ****.  The action was very inconsistent at low volume.  
Changing the weight of an action is very difficult and expensive, and IMHO, not worth the effort.  While grands are in general have a heavy action to a person that has been playing on a console, some are heavier than others.  For this much money, I would suggest visiting a large city and cruising the used and new showrooms, to find out what is available.  The nearest such city near me is Nashville, TN, but I can't tell what part of Canada you are posting from.  Seattle is a hotbed of piano sales if you are in the west.  
If you must buy something newish, there are still some old line piano manufacturers in places like Czechoslovakia and Germany that presumably are using the traditional woods, instead of the mystery wood the oriental manufacturers are using. The old US woods are holding up fine at 100 years, we'll know about the siberian and indonesian woods in about that long.   The US piano manufacturers are now Steinway, and nothing.  There is one craft brand still made in the USA but he is not big enough to support showrooms. that I've heard of.  
If your son wants to perform on a large stage someday, he'll need to build up the muscles necessary to play a standard action grand piano.  I never did practice on a grand, and am limited by strength and training to consoles, which is not a tragedy in my economic class and cultural niche, but I won't be playing Carnegie hall with these hands. About 40 minutes on a grand in a nearby church wears me out, with tendons starting to complain, not just the muscles.    But I have very slightly constructed hands, appropriate to hunting deer with an atlatl;  this may not be a problem for a person of European or African or Oriental conformation.  
If I had to buy a grand for practice for big venues , I'd look for a 20's to 60's Baldwin, whose brand reputation has been destroyed by the **** the brand owner is selling now.  Some of these are occasionally available unrestored for ~$2000 US, but not from dealers, only from heirs.  Wurlitzers pre 1988 factory shutdown are also fine pianos; I have enjoyed playing a studio Wurlitzer from the seventies, and I presume the baby grands were as good.  ( I've never seen a full sized USA Wurlitzer grand on craigslist).  Really old Chickerings and Mason and Hamlins (1910-1960) can  also be fine pianos that are mostly forgotten buy the non-specialist.  
Have fun, and don't buy too quickly.  And certainly don't buy this $4000 "bargain" if your son doesn't like it.  If you need something acoustuc quickly, a great console piano can usually be had for $300 in the smaller towns and $700 from a dealer in a larger city.  A console won't have the grand action, nor will it have the middle pedal note down only sustain great grands have.  But, consoles 39" or taller can be quite fast, with consistent low volume action one sign of quality.  In 39" or taller consoles I like Baldwin Acrosonic , Steinway (not school practice refugees, these are beat to death) Sohmer, slightly slower was Wurlitzer IMHO.  Dominion piano of Canada pre 1980 gets a lot of good recommendations from the pros on here, but they didn't sell in Indiana so I have no first hand opinion about them.