FYi had C6620 pop up now and then on TA9003i [6months old done 480k] pointed to iH coil faulty or front and engine pwb fault... changed the iH coil first with no changed, mc would run up for a bit then throw error... had a hunch, so swapped out fuser and not seen error since.. very odd as must have been issue with fuser temp control feedback to engine pwb... one to look out for guys..