HP Deskjet 970 cse jams when duplex printing

[dchamb]

I have a Deskjet 970 cse that did a marvelous job in printing duplex when I first got it. A few months later, the paper jams after the first side is printed when the printer pulls the printed paper back in to reverse sides.

I've cleaned the rollers and paper paths thoroughly in the printer and in the duplexing unit. Still the paper jams.

I've noticed from HP's web site that the duplexor parts are no longer supplied.

Anyone have any suggestions on how to correct this problem?

Thanks

Dale