On arrival downstairs condenser was shut off due to low pressure. Was able to run system long enough to get a high side saturated temp of 76 and a line temp of 76 for 0 degrees of subcooling. Pausing call due to time of night, please send me back tomorrow first call if possible to complete his scheduled tuneup and further diagnose the refridgerant leak. Returned and found leak in evaporator coil. Pausing call, please order coil.