Disklavier

Have MX10011 that I bought new in 1997, Replaced disc drive myself 4 years ago, quite a job, now having problem with piano playing fine then shuts off... disc drive still running but no power to rest of piano, Power Supply heats up then piano stops playing... let it rest a bit and it will play again fine then shuts down again... Checked with Yamaha and they said i need new power supply about $700.00... any suggestions? or input?... replacing power supply is simple procedure...