Correspondence piano technician course?

[alextryan]

Hi,

I'm a student with some free time, and I want to learn piano repair/tuning.  Mostly, when I practice on other people's pianos, and keys stick, I want to be able to say "Here's my certificate, now let me fix this thing so I don't have to wait six months for you to call a tuner." 

But... can this be learned from a correspondence course?  I'm looking at the American School of Piano Tuning, which offers such a course, and it's very tempting, but I don't want to spend the money if it's impossible to learn this without taking actual classes or being an apprentice. 

So I would love any advice!