Customer reported machine stopping after a few minutes and display and lights going off except main power light. Turned machine back on, lights and display came on for 30 seconds then off again. When I got there, same again, display and lights for a few seconds then nothing except main power light. Tested all components which read ok on the meter. All cable connections seem good. After checking the interlock display showed three dashes then went out, but no lights this time. Is this a pcb issue? And if so, which one, main pcb or display pcb? Main power light still comes on when machine is turned on, but no diplay. ❓