Arctic Reach-In Cooler Repair. I cleaned the condenser coil using coil cleaner to ensure proper heat transfer and efficiency. I removed defective piercing valve that was leaking refrigerant upon each use. Installed new high and low side copper valve taps to properly read system pressures. Verified that the original piercing valve was causing refrigerant loss and suction drop into vacuum during pressure checks. Unit is operating properly, holding desired temperature, and no refrigerant leaks observed.