Do they have a main headquarters in California? If so, the law there is very much in your favor. No legal advice intended or offered.
Yamaha Amplifier Warranty Issues
My Yamaha A-S2100 integrated amplifier under warranty has been sent to an authorized Dealer for repairs, Yamaha says the parts are back ordered 10-12 weeks and some cannot be found yet. They refuse to replace with a new amp. What good is this warranty? Is'nt there anything I can do?