Found that the primary float switch was turned at an angle to where it could not be triggered when drain line was backed up. Drain line backed up, causing the evaporator coil pan to overflow into the air handler itself, which caused water to trickle from the cabinet down the mastic on the side of the return Plenum bypassing the emergency pan And wetting the drywall enough for the ceiling to collapse. I tested both switches filled up the pan to ensure there was no leaks and repositioned the primary float switch. Unit is running and draining well at this time.