And while you have the door panel off, white lithium grease is your best friend.
Grease the regulator, all the plastic window rollers, tracking, or replace the rollers if not round.
Grease the door closer, all metal pivot joints. Window crank, door handle, outside, inside, just a little is better than none. And if I remember there is a little metal bracket that goes from the inside door skin that goes from the outside mirror to the inside door frame under the vent window that re-enforces the outside door skin from flexing, kinking the metal weekning the skin. Allot of times it is gone, or maybe it is not on the D30 at all.