Kind of the opposite to this, I had a Sony amp go on the fritz less than 12 months out of warranty.
Rang Sony, no service centre in perth for amps etc. (only tv's apparently)
Took it in, $60 to check it out, has to go to Sydney.
two weeks later I get a call, "Sorry we cant get the parts anymore, but can give you a large discount on a new unit".
I checked out their "large" discount, and discovered I could buy a brand new Denon model, including 3d and 4K passthru etc (missing from my older Sony), for less than their reduced price units.
Anyway, I buy the Denon (very happy with it so far) and have Sony return my broken amp with the thought in the back of my head that I would try and get it repaired by a non Sony person - with thoughts of selling it.
the unit comes back, I plug it in and guess what, its working perfectly


Now I have two perfectly working amps

.
Oh well, my back room with a TV for watching the footy has never sounded better