GV VD-122D not powering on.

I have a VD-122D used outdoors, installed 5 years ago. For a couple months, it would disconnect. I would just power it down, power it back up and it would connect again. This week it won't come back up. I've pulled it off the wall, everything looks normal, can't see anything wrong with it. No water penetration, seals were in perfect shape, no condensation.

I connected it directly to a new POE injector, nothing, no lights, anything, just dead. Is there anything serviceable on these, like maybe a fuse or something inside? Do people actually sent these out for repair, or if they're like this, normally just replace them?

Anything I can try to bring it back to life?

Thanks.