There is no switch involved. The direction and action is controlled by two pins, 21 and 22 on IC8 that provide a differential voltage to dual op-amp IC9. I do not have access to the service manual that may explain how end of travel is sensed.
The reed elements closest to the end of the board are indeed mute switches, and they
are known to fail. I have replaced many.
Cut them at the bend, pull them out, insert new and solder to the stubs of the old.
