I've heard these are not repairable. There's a Chroma available
locally for cheap but several of the membrane buttons are
non-functional and half of the ones which work have bad lights. Is it
possible to find replacements?

Incidentally, I contacted a friend of mine who works at Fender, and he
says all of the old pre-1985 stock was left behind when Fender was
sold that year. Somewhere somebody has these parts stashed away.

Thanks, Bill