Customer explained how system has a gas leak. I performed a leak search on all gas fittings. Everything is secure and not leaking before the valve inside furnace. The only other thing it can be is the gas valve on the furnace because they have had issues in the past where the solenoid would slowly close causing a gas smell. Swapped the gas valve with new. It worked for a minute than quit. Than is would not want to reopen. There is proper incoming gas and voltage. Spoke to manufacture, we will have to replace the gas valve again. Will order parts in morning. Then return to perform the repair.