Looking for C4XD circuit board.

[Drunkenclam]

My guess it would be one of the opto devices. Is it for the stop buttons?

If you can see if your motherboard has leds that show when a button or lever is pressed. You should be able to work out which one is faulty. then unsolder it and put in a replacement yourself. Or do an internet search of any local repair places. like tv/ hifi repairs etc. It never hurts to ask. they can only say yes or no. The more you can diagmose yourseslf, the cheap it will be.