I have a 14-yr.old Wurlitzer WD-2 digital piano. It needs repair. Where can I find someone in the Houston, TX area who can address this issue? The piano turns on, then spontaneously stops operating after a period of time (maybe 20 minutes, maybe an hour). It's as if something has heated up and the piano shuts down. I really like the piano and want to keep it, but it needs repair. Help! \:\(