You will need to remove the regulator to repair or
replace it. Disconnect the power wire and make
sure the regulator is no longer connected to the
bottom of the window glass. Slide the window
glass all the way up by hand and keep it there by
using a wedge. That makes room to maneuver
the regulator out of the door. The regulator is
held in by 3 nuts, 1 bolt and a metal tab at the
top.

The part that usually breaks is called the regulator
guide jaw. I have repaired them with epoxy and
jb weld, but they will not hold up. It is very hard
to find a regulator guide jaw that will fit, but
purchasing the whole assembly is expensive.

Darrell