Repaired a Kolpak walk-in refrigerator today. Diagnosed faulty Copeland Scroll compressor using Fluke 87V multimeter. Replaced compressor and Sporlan filter drier. Evacuated system with JB Industries DV-142N vacuum pump. Recharged with R-404A refrigerant using Yellow Jacket 42006 manifold gauge set. Installed new Dixell XR75CX digital controller. Tested system operation, verifying proper temperature maintenance and defrost cycles.