Found the Reach-In Cooler unit on and running with the box temperature at 50 degrees Fahrenheit. Turned off and then back on. Found the suction pressure was in the forties. It dropped to about 33 psi after awhile and then just stayed there. Added a couple ounces of refrigerant but it did no good. Removed the evaporator cover and let the unit run. The inlet lines did not even start to frost up. Believe that the compressor is not pumping properly and is inefficient. Need a new compressor. Copeland ART51C1E-IAA-103. Left the unit on and running. Note: quoting additional repairs, closing out work order.