Upon arrival for tune up systems on and heating. Inspected units. Changed filters. Drain lines clear. Blowers slight dust buildup. Coils have slight corrosion build up. Main area furnace ignited and heated properly. Bedrooms furnace gas valve received power for a few seconds before opening. Gas valve appears to be starting to jam. Customer said they would call their home warranty company. Both inducer motor amp draws good. Left units on and heating.