Today I performed a routine maintenance on your heat pump split systems. I checked all electrical connections on both indoor and outdoor equipment, flushed your drain lines, checked the air filters, checked your capacitor, ratings, and rinsed off the condensers outside. During the maintenance, I noticed the downstairs system had an error on the thermostat for excessive runtime in cool mode. After further inspecting the system, I found a loose connection in the thermostat. I tightened up the thermostat wires and tested the system operation and everything seems to be operating properly/cooling properly on both systems. The customer is concerned with some stains on the upstairs bathroom vent. I will send an estimate to pull the supply vent clean it seal it with insulation tape and reinstall