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Performed precision a/c tune up on 2 luxaire heat pump systems. (1) 20x25x1 air filter was just replaced for second floor system. Replaced (1) 20x25x1 air filter for first floor heat pump system. Checked all electrical conections and components. Blew out condensate drain. Recommend installing an ez trap for second floor air handler. Also while I was on site, the second floor heat pump started making the high pitched noise Jonathan had described before. Found that after the second floor system satisfied the call, the reversing valve was making a loud whistling noise. Recommend to him that we first try lubricating both systems with a product called a/c renew. Recommend we put this in both systems. Also tested capacitors at both outdoor units. Checked refrigerant pressures and temperatures at indoor and outdoor units. Both heat pumps are working fine in a/c mode. Found reversing valve for second floor heat pump making a loud noise when pressures equalized, this can help lubricate interna