On a whole different scale of good fortune, i bought a Korg SDD-2000 delay rack for £5 the other day as it wasn't powering up properly. I sent an email to Korg asking if there was any possibility i could get the schematic and massive respect to them, within half an hour they had replied with a copy of the manual, the service manual and a hand written load of tips on what to look out for from one of the original design team! Now thats what i call customer service!
Replaced a voltage regular, resoldered and reseated a couple of connectors and now i have a fully working £200 odd delay rack for a total of about £6!