IIrc this topic has been discussed a couple of years ago. I don't have the
answer and if you don't get one you might try Google, it has to be there.

Roy

I stole this post from the TDR, maybe it'll help.

There is a cable that connects the inside door handle to the door jamb
handle. I pulled the door jamb handle out by removing the two torx screws.
On the back of the door jamb handle you will see a bracket that the cable
attaches. The cable has a plastic sleeve on the end where the cable goes
into the bracket. On my truck the plastic sleeve broke causing slack in the
cable. I was able to unbolt the latch rods from the the handle and remove
the cable as well. I then drilled several small holes in each large end of
the plastic shield. Then I used small pieces of wire to tie the plastic
sleeve back together. I used a plastic wire tie to secure the cable back to
the handle bracket. I rebolted the latch rods to the handle and reinstalled.
Everything works. The only other alternative is remove the door panel and
replace the cable. Be careful you don't drop the latch rod bolt down the
door, and be careful you don't bend or damage the latch rods. Also watch the
spring on the handle. You may want to put tape around the handle to prevent
any scratches.

If that isn't it there was much discussion about penetrating oil, lots of
time to soak in and kicking the daylights out of the door from the inside or
beating it with a 10 pound dead blow hammer.  I think I need to go out and
lube mine now before it sticks...