My boards don't go up and down easily but they can be adjusted if I do the little wiggle - a quick bear away whilst pulling up or down. I built them and I curse the fact that the builder
did not add wear strips - however they are silent which is very nice.
I would pull the boards out and have a look. The paint
will be worn away at the high spots. Sometimes boards get thicker in the middle where extra layers of glass have been applied. Also some owners antifoul the cases a lot. I put antifoul on the board end (my ends are little looser) but only a light coat in the case. At the mooring
the board antifoul seems to protect the case too as they are really close together.
Maybe you are super lucky and all you have is lots of paint under the waterline in the case. So get the snorkel and the wet and dry out and use a stick to sand it away.
If you are somewhat lucky the worn spots on the board will be paint only. Then just sand the bugger down on these areas with a something like 40-60 grit and get the paint off. Dig into filler if you have to and get it sliding. Then you can add some high build and a thin coat of paint to the needed areas.
If you can see glass at the worn spots, then things are hard. You will need to do some surgery that requires new laminations. Try hard not to go there.
So pull the boards and send us a picture. Pulling boards is pretty hard on wide cats, and yours are big so use a halyard- better yet, use a yacht club Etchell lift
or a small thin monohull
rafted alongside. Mine point outward slightly and require a few rude words and a physio visit to extract.