GMC Safari Stuck Sliding Side Door

I have a 1989 GMC Safari SLE. My side sliding door has become increasingly difficult to open over the years despite greasing the wheels and tracks. For a while we have been able to open the passenger
front door and pull on the edge of the door to open it. It has become so difficult now that my wife and kids can't open it except from the inside. I noticed that there are two tabs on the door's front edge that lock into the pillar containing the slot for the post and the electrical switches. The plastic on the bottom of these tabs is worn down to bare metal underneath indicating that the door is sagging. What parts can I replace to get this working like new again? Thanks! Barry
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I looked at mine. I am fairly sure if you remove the trim, there are bolts holding the door at the bottom front to the roller that holds up the front of the door. If nothing is noticibly worn, loosen the bolts and lift the door and tighten the bolts.
Let me know if this fixes it, mine is sagging in the front a bit just not enough to remove the trim and mess with it.
Scott
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