Yamaha has repaired many, many out of warranty keyboards at no charge. The S900 immediately comes to mind with its failing display.
The best in-warranty folks you'll ever run across is Logitech. When a single speaker fails they send you an brand-new, replacement sound system. No charge for shipping, no returns necessary, just a complete system replacement.
Gary
Yep...Logitech is awesome.
I have several of their products...two Z-2300 systems, USB Headphones & microphone combo, keyboard and mouse, and a G-25 Leather wrapped Steering Wheel & Pedals (absolutely terrific for driving games).
Had an issue with one of the Z-2300...replaced without any problems.
Ian
_________________________
Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.