2ND 13 POINT MAINTENANCE TUNE-UP UNDER SERVICE AGREEMENT FOR 5 YR HT UNIT. MADE SURE UV WAS INSTALLED PROPERLY AND LEFT WORK AREA CLEAN. CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK THERMOSTAT, AIRFLOW, AIR FILTER, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS OPERATING GOOD.