"cx complaint is a screaching noise that happens randomly when unit is in use. no saved codes. ran the unit for a while. i heard a little screach once whlie unit was running, also had a rattling noise that happened once while it was running for a second or 2. it was quiet the rest of the time. i inspected and found idler and 3 rollers spin freely. the last roller is very loose and rattles when spun. removed roller and found it rusted inside. replaced with preIDed part and tested unit. it remained quiet. unit is working as designed."