I just received the keyboard back. When I press the test buttons, I get: error- TGL2 NG. The Combi, Prog, Global, Multi and 10's Hold buttons light up and flash simultaneously. I quick call to a local repair shop = this advice. The error is for a tone generator, but that seems unlikely. IT's $85 an hr. labor plus parts. I can't afford that for this little board.

I need HELP!