Anyone have an idea how to fix bumper sag on a 2001 CRV ....it's only the one rear corner

Tried looking underneath with a torch but can't see anything that looks out of place ....but then this is my 1st Honda I'm not sure how these are put together 😁

 

could be missing either bolts or the bumper support inside.
the bumper support(beam) holds the bumper up after years of fading and warping and pressure

 

This is the sag

 

looks like either old age (maybe heat over the years)
ppl have pushed down on it.
or you hardware coming loose(not likely)

you could remove it. tap the bumper support up a tad with a hammer. put bumper back on and it could be 1/4" higher.

 

Ah that makes sense my friend tried putting an exhaust center pipe and backbox on at the same time and he did say he got it wedged a bit and thought he cracked the plastic ......it was the day after this I noticed the sag