Tested system not cooling for the upstairs level. Found the compressor outside, rotor locked and will not pump the refrigerant. Also tested the windings with a megohmeter and found the windings are bad. This outdoor condenser unit is 12 years old and both the indoor coil and furnace are 2024. Advised customer that it may be time to think about replacing this unit instead of putting that money into a repair on an old system.