Customer has 4 y/o 2-zone Lennox system that operates for main level. System was not cooling due to water in pan tripping wet switch. Removed water. Replaced dirty 20x25x4 media filter provided by customer. Condensate drain pump operational. Dampers are operational. Plenums are sealed properly. Noticed no bypass zoning damper for system, which is recommended. Blower motor speed correct. Plumbing p-trap needs cleaning, which is where condensate pump vinyl tubing terminates water. Pressure levels were normal. Condenser electrical components are good. Coils are fair. Recommend UV BlueTube to target and prevent biological growth on evaporator coil. System is currently working.