Top oven conveyor is now working . Customer said the conveyor switch was moving to much. and the numbers on the display would come on and off. Checked and motor brushes are ok. Chain is dry so I lubed it up . Open control panel and found the conveyor switch moves and a wire is pulling out because of it. Tighten down the switch and trimmed back the wire and secured it in the switch block. . Power on and conveyor come on and is ok. all tight now . no other problems. in service