Performed a heater tune-up on one heat pump system. Checked all electrical, mechanical and performance of the system. Filters were replaced with customer supplied filters. I used my vacuum and hooked it to the drain line outlet by the condenser. I then poured 2 gallons of water in the primary drain pan and then treated the drain pan. I washed the outdoor coil and secured the compressor wiring to prevent any electrical rub outs. No other major issues were found, and the system is operational at this time.