Customer said unit is not cooling and wire were exposed. Thermostat wire were damaged and were making shortage and blown the fuse. Replaced 3 ft of thermostat wire and replaced the fuse. Performed start up procedure and noticed that compressor is working hard at 80% capacity and normal compressor works at 60%. Unit is an R-22 system and is older than 18 years old. Recommend customer to get a new unit.