completely gone over--total flush of evaporator condenser and all lines--- installed new Tecumseh ae4450y-aa1 compressor--didn't want to mess with a 10 year old compressor-I am selling this with piece of mind--its like new-- flushed 4 times with high pressure nitrogen--evacuated to 50 microns 5 times breaking wit nitrogen -I have 40 years experience in this type of equipment and others--this unit sells for around 7000 new