Found water in drain pan and float switch tripped. primary drain line on both units are tied together Necessary to install blowout valve in order to isolate the pressure. Install two blowup valves, one on each unit and cleared drain line. Also adjusted drain line pitch to ensure proper drainage. Measure 20° temperature split from supply to return. Dumped 2 gallons of water down each drain line to check for leaks and ensure proper drainage. On the outdoor unit, I found a bad contactor testing at 21 ohms. This is outside of manufacture, specifications and expected to fail. Advised customer of the bad contactor. He did not want to go forward at this time, but said he would call to schedule soon. Both units in good working order upon departure.