This is an old upright display case. R22, semi herm with hot gas defrost. No discernible Model or serial. No crankcase pressure regulator. Box temp was high (50*). Superheat would fluctuate between 10 and 16*, suction between 59-62 psig. head pressure was 215psig (appx 107*) with about 8 degrees subcooling. Initially thought the hot gas solenoid may have been leaking through but I didn't see any temperature difference that would indicate that. At any rate, my suction was too high. I'm not sure what is causing this. Ambient in the store was 73*. Any insight would be much appreciated.