For this job, Technician performed two system furnace maintenance tune up on two 5 year old Goodman systems. Technician checked all safety devices and components that are in use during the furnace season. Technician found the Downstairs furnaces gas valve is intermittently working and needs to be replaced part is still under warranty. Both systems do not have any surge protection at all, Systems really need surge protection to help prevent a power surge or power outage affecting the motors or control board. Manufacturers do not cover parts under warranty that have been hit by a surge.