[1retired06]

Agree. Likely leak candidate could be a compromised seal, and unit must be pulled to verify and correct. Not that hard if you are handy. May also be the AC unit simply needs to be tightened up. For quiet system, lag bolts at the roof. For traditional, four long bolts inside the unit after pulling the vent. Might also check drain holes for possible block, by removing the cover and inspecting.