My Brother HL 5250DN indicates paper jam when in

You problem is more than likely in the fusing assembly in the rear of the machine. The Brother HL5250 is famous for having bad fusers. Open the back door and closely examine the lower fusing roller (orange roller). You will more than likely see that it is crinkling badly or the clear outer cover is delaminating on the roller. Sometimes you'll need a flashlight to see the delaminating but it will look like the clear outer sleeve has a bunch of clear oil under it causing it to ballon out in spots when rolling. Only solution is a new fuser. Sorry for the bad news but better than not knowing.

Hope that helps you. :)