I am not sure what year your trailer is, however there was a recall a skylight while back.
The issue was the sealant that was being used around the edge of the sky light reacted with the plastic and made the skylight brittle.
There are a number of threads that describe the issue on here.
I noticed condensation between the two panels in the skylight. I removed the inner panel and found damage to the roof plywood (see pics). I called my dealer and the damage was covered under the recall.
Damage was extensive. The entire roof was replaced, the front wall was replaced (where I park it it slopes forward) , 1/2 of the floor plywood, all of the vinyl floor, some wiring and plumbing(easier to replace then work around??)
If you suspect a problem get it looked at quick.
Sent from my iPhone using Forest River Forums