87 m23 "difficult" opening one side

Hi, me again.

This forum is so helpful, I thought I'd ask another one.
The 1987 TM 23 (which I haven't seen yet and which is 260 miles away) is reported to have a problem opening the front side.
Not that it won't open, but it takes two people to push it up instead of the ease of opening that is indicated in the TM videos. It closes easily. The back also opens and closes easily. I don't have a problem if it takes a good push to open, and I'm going to try to see if opening it with the front leveled lower will help, but my concern is whether I may be in for worse problems later. Might this indicate some sort of damage that might get worse to the point where it won't open at all? Could an adjustment of the torsion bars help? That side of the trailer has been "redone" for some unknown reason. Aluminum replaced, etc.

Any thoughts?

Thanks.