Ultimate Cooling Tune-Up: cleaned coils, brushed and cleaned traps, added pan treatment tablets to pan. tested and checked all controls, wiring connections. tested temperatures, checked filters. checked refrigerant temperature and pressures, tested static duct pressure. tested blower operation, tested cooling operation to ensure working within manufacturer specifications. O-ring on service caps were bad. Went ahead and replaced service caps with new ones that have O-rings to prevent any leaks out of the Schrader valves. Check filter looks good for another six months