Thanks Gary,

Don't mind my ignorance - but I'm not sure what the 'leaf switch' is, nor how to bypass it.

I called Yamaha, and they said they have the spare part for $100. I can't just buy the $3 socket as it is welded into the board and connected to at least four points on that board. I don't really want to put that kind of money into my backup keyboard...

I did pull out the plug to the whole headphone section - but all that did was disable all four of the speakers.

Thanks, Chony.