I am sorry, but I believe that the top roller that you refer to is the fuser roller. If the tear is small enough so it doesn't effect the copy, go ahead and use that fuser. Otherwise, you will have to replace the whole fuser. If you do replace it, save the Fuser Roll, on top of the Fuser, it oils the roll to prevent paper sticking to the roll.
Any time there is a Jam at C. the first thing is to open the right hand door and see if the paper can be removed from there. If it is too far in to reach, try turning the big Blue knob on the Fuser clockwise. It may just roll the paper out. Don't crank on it to hard or it will just jam the paper against the fuser roller and then it is tough to get out.
Some times the fuser can be salvaged by partly dis-assembling the fuser by taking out the Fuser Roll and removing the sheet metal piece just above the bottom (Red) roll. That is the piece that is covered with a strip of black velvet and has a small Philips head screw on the right hand end.
Use a pair of small forceps and work the paper out carefully. If the jam is too bad you will ruin the red roll and the fuser will be useless, but it would have been useless otherwise so nothing has been lost but your time.