Upon arrival unit was off. Checked air filter and it was good. Checked condenser coil and found it was dirty. When the condenser coil is dirty it traps the heat and causes the pressure and temps of the refrigerant to act higher than they really are. Washed the condenser coil to remove the dirt buildup. Checked wiring in the condenser electrical compartment and at the compressor. Found a mouse nest in the compressor jacket. Removed the jacket and the mouse nest. Did not see any damaged or chewed up wires. Checked the condenser for any traces of Uv dye and did not find any. Started and tested the system and found the unit was slightly low on refrigerant. The manufacturer states the unit should have 11* subcooling +/- 3* and the unit was bouncing between 7-9. After getting customer authorization we added 9 oz R410A to the system bringing the subcooling up to 13.6* which is acceptable. Had a 17.5* temp difference between the supply and return before adding the refrigerant and 21* differenc