having trouble with this machine getting j19s. Replaced actuator sensor above reg roller and ran 150 duplexed copies with no jams...hmmm..prob solved. Hour later get a call back saying it's doing it again. Replaced duplex clutch ran 75 with no jams. Hour later call saying it's doing it again. Had them use just letter-r tray and not getting any problems. Later in the day they used letter tray again for 2-2 (65 copies) with no problems. Looking for some suggestions! Thanks for reading..