parking aid sensors intermittent
 

I recently had to have the rear bumper on my 2017 f350 platinum painted. since i got the truck back the rear parking aid sensors have been intermittent. I'm assuming that when the bumper was put back on the truck the body shop did not achieve a good connection when reattaching the wiring harness. where would the wiring harness be located that they would have disconnected to take off the bumper?
I would like to try to take care of this myself as getting the truck back to the body shop is a chore in and of itself.

If you look under the hitch, just to the 'left and behind the hitch structure' leading over to the left frame extension you'll see the connectors..

Thanks, i'll take a look!