AC Diagnostic System: Apt 1031 Refrigerant Type: R410A Metering Device-Fixed Orifice SP/HP 0/0 Returned tstat to original settings: Y Unit operational; prior to leaving: N Notes: Met with Isaiah owner of the apartment complex. The system for Apt 1031 was completely void of refrigerant. His maintenance team had nitrogen which I used to pressure the lines and check the complete indoor and outdoor units finding no leaks. Determined the leak is inside the wall like we found on the apt I checked here a couple months ago. He’s going to have his maintenance team cut open the wall To expose the copper line then have us return to replace the copper line set. I will have have office call Isaiah to coordinate work. Isaiah mentioned that he would also like to us replace the lines in the other apt we found leaking. In another week or so.