Upon arrival system was on cool and thermostat was satisfied at 77 Asked homeowner for filters to replace and vinegar to clean drain line Dropped thermostat a few degrees to keep system operating during tuneup Went into attic and changed out air filter and started checking delta Return air was 75 and supply air was 57 for a cooling delta of 18 Removed airhandler panel to expose blower and Evap coil Noticed blower had large amounts of biological growth on the fins and surrounding wires Blower motor itself was still in good condition and blower capacitor was in tolerance Electrical connections tightened and secured Evap coil was clean and in good condition, Txv is present Poured vinegar in the drain line then chased with 2 gallons of water to test drain line and no backups Moved to outdoor condenser unit Checked disconnect, in good condition and I pulled it out to kill high voltage to unit Checked dual run capacitor, in tolerance Electrical contractor in good condition and electrical c