I went to 2 units that I installed a little over a year ago, and one had a grounded compressor, condenser fan, and oil in drain pan. The other had oil coming out of p-trap, and compressor sounded like it had no oil in it. The units are a 4 ton and 3 1/2 ton packaged heat pumps 410A. Both units were leaking at the evap coil, they had oil in the drain pan. I am going to replace the evap coil, compressor, and filter drier in both, but do I need to run a cleaner through the system before installing the new parts. I will do a triple evacuation, but I'm not sure if the system should be cleaned first.