rear window leaking 93 325 RK 5th wheel

[Farmer Jon]

My rear window is leaking but not all the time. Sometimes it will down pour rain and it will not leak. The next time it will just sprinkle a little bit and be all wet. Most times it don't leak at all. Took it back to the dealer they pulled out the window. They were short handed so I helped. I didn't mind I like doing my own stuff. The wood was completely dry and looked brand new.
the window sill gets wet and it runs onto the counter. I cleaned out the drains. I dont know what else to do. Every time it rains and I go in there to watch it it wont leak. The place it got it from is not a Jayco dealer and didn't know much about the windows they use.

[RedHorse1]

Could it be condensation?

[Farmer Jon]

I finally went to an actual Jayco dealer. I talked to the tech that had been there for years. He said to take a screwdriver and make the drain holes bigger. I did and so far so good.