Upon arrival customer informed tech that when they turned on ac within a few hours they saw that water mark upon further inspection. Tech did not find any drain issues with the unit no drain lines above the ceiling where the water Mark is except aux drain which drain pan is dry indicating no water in the aux drain line present tech did find a vent pipe going through roof near the area when tech moved insulation around tech found some insulation moist but not wet customer invested on mpa tech did not find any issue with unit