Performed A/C tune-up on a Trane straight cooling system. Checked the electrical, mechanical and performance systems of the unit. Cleared, cleaned, flushed and treated the drain line and cleaned the exterior of the furnace. Replaced the high voltage wire nuts with wago wire connectors. I did find there is no water safety switch on the secondary drain line and the outdoor fan motor is showing some wear and tear. I spoke with Ms. Carrick and presented repair options. No other issues were found. The system is operational at this time.