Right on site and installed pressure probes and did confirm that the system is out of refrigerant, my pressurized it to 345 PSI. It dropped roughly 7 psi in about 10 minutes time, I did not see anything blatant at the condenser that is leaking. We need to return with a 10-ft step ladder to be able to get up above the ceiling and check each of the ceiling cassette units and the branch box connections.