Screws heads broken off on slides.
Last weekend l uncovered my ACE 29.4 and started checking it out after sitting all winter. I went around the slides to make sure all the screws were tight and several of them broke off just below the head.
I had to drill new holes and put in new screws for the ones that were broken.
Some were on the top and sides, but the majority were on the bottom outside trim piece of the slide.
Check yours to make sure you don't have any broken screws.