Quote Originally Posted by jfkansas View Post
Probably a switch, or the cable. The cable doesn't move so there isn't really any wear on it so I would say the switch most likely.
Yep, that would be it. Unfortunately I don't know an easy way to send Gcode commands to the flashforge (simplyfy3D maybe? or some convoluted USB s3g conversion...)

Normally you would send M119 to the machine and check the status of the endstops, but in your case the light should be coming on when it's contacted. If no light then yeah problems. Check the voltage from the wires, if no voltage then connection and if voltage yes, but light no, then end stop. They are $2 to replace tho, it's nothing to worry about.