DC 5000 jams with 9-120

Hi
My dc5000 is showing continuous paper jam with any media with the jam code 9-120 in PWS .

The paper jams either just above the 2nd BTR or on the first vaccum belt.the transferred image on paper shows slight mis registration.

I checked all the sensors in registration assy, 2nd btr and on vaccum belts.

Rest all looks fine to me.

Any suggestions on what I am missing?