Performed a three system maintenance checking heating, checked all electrical and mechanical components and safety switches. Checked amp draws. All systems are heating. Found that the gas valves for the master system and upstairs system are getting stuck on first try to ignite burners. Valves are under warranty. John would like to move forward with replacing both gas valves. Parts ordered at Lennox in Allen. Will need to reschedule and come back out to replace valves.