Slide out bubbling

[Annmavin]

Does anyone know what’s going on here? I hope the pictures are clear enough. I just noticed this bubbling on one of my slide outs recently. Is this a big issue? I have a 2013 forest surveyor if that helps

[D W]

Can not clearly see the bubbles you speak of. Are the bubbles in that black streak that runs through the graphic? Normally, bubbling is the first stage of delamination of the fiberglass from the sandwiched wood caused by water leaks which dissolve the wood product releasing the fiberglass where it is glued to the wood. If caught early enough and corrected it's not fatal, but left go it can turn into a cancer. If this is the case and you're not versed in fiberglass repair, it is best left to professionals.

[Gmoney67]

Looks like the window may be leaking down from window.

also i wouldn't be using slide supports.