Completed maintained for the condo. Checked all voltages and amperage’s. Cleaned drain line with vacuum and cleaned the primary drain pan. Checked refrigerant charge: good. I observed that an existing 1/4” discharge line is being used and spliced to the 3/8” on the condenser. The copper runs in a chase from first floor to roof. The leak was not detected and it is adjacent from the primary drain line. Did not find any water marks that would indicate location of leak. Equipment is operating and cooling.