Arrived onsite for cooling maintenance on 2.5 ton system. System is 12 years old. Performed inspection of the performance, mechanical, and safety systems. Cleaned outdoor unit. Found fault in the voltage enhancement system. Repaired fault and continued inspection. Found fault in the refrigerant system. System going off in high pressure. Indications of a restriction in the refrigerant system most likely the metering device and filter drier. Also last year there was a low refrigerant issue. Inspected evaporator coil and used electronic leak detector. Observed significant rusting and deterioration on the coils. Did not find a leak with the detector. Discussed repair and replacement options with the homeowner and she elected to replace the system.
