Hi , I have a jamming problem with IR7086+V2 Fininsher, ONLY on multiple A3 buckles on trailing edge and then jam in V2 , PS3,4,5 sensors registering jam, have replaced all worn rollers and sensor arms in fuser,duplex and exit areas. A4 multiples ok ,A3 duplex feed fine. Any help would be gratefully recieved, thanks.