You are working on a 42°F smoked meat walk-in cooler that has had a complaint of tripping the oil safety control about once a week. You check the oil level and find it is at ½ glass when the cooler is nearly ready to shut down. Since this compressor is remote is uses an automatic pump down cycle. When the thermostat is satisfied the compressor begins pumping down, you notice the pump down takes a long time to complete, upwards of 5 minutes. You install gauges and find that the system is indeed slowly pumping down marked by a steady decrease in low side pressure but during this time the oil in the sight glass is foaming up violently and the net oil pressure is dropping from 30 psid downward. What is the problem or what would you test/check next? Is there any additional information you need?