Call out-Found Walk-In Freezer system low on refrigerant and there was oil all over the side of the compressor. There was a cap on the suction flare port that was leaking so I replaced it. The cap on the receiver stem was leaking as well so I put thread sealant on it and when I tightened it the leak stopped. I also noticed the low pressure switch was sticking causing the compressor to run into a vacuum, so I replaced it as well. I added refrigerant and the box temp is now dropping.