Sorry... have to take issue with that. Soundboards and pinblocks can get damaged over time for various reasons, and there are good, legitimate reasons to replace soundboards and pin blocks.
I have also played many great rebuilt Steinways from non-Steinway dealers (a few of them mentioned in Hmoll's post, they do good work and they charge accordingly, and yes, they replace soundboards and pinblocks in many cases and the pianos turned out very good). So I don't think slamming all "mom-and-pop" rebuilding shops in one fell swoop is fair. But I do feel sorry that you've had such bad experiences with some mom-and-pop rebuilders in the past and I do not dispute that there are many incompetent rebuilders/restorers out there.
Sorry if I came off 'slamming' small rebuilt shopes etc... what I mean is that the difference in price between small rebuilt dealers and an 'Authorized' dealer is just a few thousand dollars,, for instance:
Steinway 'A' (6'1" Satin 1900-20) were around 22-24 grand from small piano dealers,, who cannot put any of the rebuilt in writing... but for around 5 grand more.. you get the whole pacakge,, no worries. Honestly,, I dont have the time to go around and round ,, find a piano,, call a Steinway tech ,, make an appoinment ,, yada,, yada over and over again just for a few thousand dollars,, you're already paying 25-30 grand,, whats a few more...
Steinway has a strong name,, its not like Bohemia where you really don't care about papers and such things,, look at my Rolex example,, you'd buy a Breitling from a regular watch dealer,, but you'd be crazy to buy a Rolex from anything but an 'Authorized' dealer.
Now another advantge with an authorized dealers is the re-sale value/backing of your piano.. a Steinway without papers is as good as your word,, its like buying a Rolex watch without the box, serial, papers, etc... I look at a piano as an investment and this is what seals your investment.
As far as the comment on the soundboard and pin blocks,, it goes like this. The only 2 parts that Steinway will not sell to anyone (including authorized dealers) as a replacement part is the pin-blocks and soundboard, you can call steinway yourself and see. In other words if you find a rebuilt steinway with a repalced pin-block, its probably some after-market part. However rebuilt shopes sometimes just re-finish soundboards or pin-blocks instead of rebuilt them (ie: you would not want a cracked soundboard to be sealed). When your piano was built,, it was not made to be disassembled, so when a rebuilder takes your piano completely apart,, he will
never be able to put it back together as good as the way it came out of the factory. so you really need to research the history of your piano..
-as