2ND MAINTENANCE TUNE-UP UNDER SERVICE AGREEMENT FOR HT UNIT. RENEWED SERVICE AGREEMENT. INSTALLED 4T FURNACE 12 YR P&L. MADE SURE UNIT WAS INSTALLED CORRECTLY AND WORK AREA WAS LEFT CLEAN WHEN JOB WAS FINISHED. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, AIRFLOW, AIR FILTER, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS RUNNING GREAT.