Performed system tune up in 4 split systems. Inspected all electrical components and found no issues. Capacitors are in range. Coils are clean. UV systems are not operational and I highly recommend replacing the expired bulbs to improve air quality. I provided info to the office on my last visit to acquire them. Please Contact customer with pricing on replacing the cores 20 minutes per unit labor, 4 units. Flushed all drains with nitrogen. Left all systems in good working order. Note: please contact costumer next week for TAPS renewal.