2ND MAINT. CHECK-UP UNDER SERVICE AGREEMENT FOR HEATING UNIT. RENEWED SERVICE AGREEMENT. UV STILL WORKING. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK AIRFLOW, AIR FILTER, THERMOSTAT, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS OPERATING GOOD.