Arrived on, 07-17-23- Matt Tim Found front of house AC unit was non operational. Transformer was tripped. Checked over all wires and found second stage low pressure switch was shorted on discharge line. Turned unit on and right side contactor for first stage cooling was chattering heavily. Transformer was overheating, and would trip slowly with a delay. Found power dropping in and out on coil voltage. Replaced transformer and contactor. Rejecting heat very good. Unit is operational at this time. Job complete.