Hey guys I'm checking out a Copeland M# ERF1-0310-TAC-218. This compressor serves a walk in cooler. It was holding temp ok and pressures were good. But the customer was complaining ab out the loud almost like tick nouse it was making. I thought maybe one the reed valves starting to go bad. Called local rep. And he agreed. I pulled the head and all looks ok. Any other ideas. Let me know. Thanks.