Complete 1 system furnace repair and preventative maintenance check. Check and find a heating furnace operating at this time. The customer stated that the furnace failed last night and come back in the morning. No error code on the furnace. Check safety and operations and find furnace operating at this time. Concern furnace control boards may not operating normally but do not detect problems at this time. May need to replace the control board for the upstairs furnace. Give customer estimates.