1-30-23 Mon 4.75 hr Walk in freezer in the kitchen is at 33° On arrival checked in with Jenny Then get up on the roof to check the condenser unit, there are bubbles in the the sight glass. Added 3 lbs of R404a just cleared the sightglass, outdoor temperature is 23°F Head pressure was down in about 175psi The headmaster control is function. Once I added the refrigerant noticed that the condenser coil had no airflow across it. Blew out the condenser coil with dry nitrogen I have better airflow now. Box temperature drop down to 17° However my superheat is about 20° Should be around 10° but the box is still warm Thermostat is set for -5° I spoke to Rick we need to do a good cleaning of the condenser and a check on the refrigerant circuit on a warmer day.