I preformed summer tune up on Trane Xbox 19, system running within manufacture specs and found no big issues. Homeowner pointed out that there was a plastic piece on AH that had been taped on and looks broken and keeps coming off from pressure. I sealed it up from back with same piece to block air and told him I would look into getting it fixed if that piece is available and will get back to him. Unit running at departure with a 20 degree Td