The Roland Gxxxx serie often show defective buttons... not the microswitches but the PVC parts. The buttons are mounted with thin joints that allow the vertical movement.

I had to replace microswitches once or twice in KN2000 and KN3000.

Because the modern soldering techniques are good alsmost no 'dry joints'.... only onboard RCA's have many problems. (they just are too weak for mobile setups)

In my SD1 I had to replace 2 switches after Ketron put a brandnew display/switch board in it. (for free)

I wished XLR's become standard-connectors some day. (much better)

Roel