Compressor replacement removal of old compressor, filter dryer and electrical plug harness for compressor. installation of new compressor new filter dryer relocated filter dryer to outside of condensing unit to allow for easier service. Installed new electrical compressor harness. inspected system for premature failure of existing compressor found possible cause piston never changed out when unit was installed. this could cause premature failure of new compressor if not corrected. warranty is void recommend correcting proper piston size to allow for compressor to operate at proper pressures and temperatures.