I have an 81 model and can tell you this from experience. The putty tape has dried out and is past its service life.
Remove every trim piece on the outside and reseal them. I personally used sillicone but most use the putty tape rolls from rv stores or hardware stores. There are 2 types of this. The original plumbers type putty tape like used on sink drains and one called butyl. Butyl is better and more sticky but harder to work with.
If you can, replace the trim unless you have more time than money...like me. It is a pain to clean the old putty and residue off the trim and trailer.
Also, pull every window AND both caps and reseal them too.
Failure to do this will, not may, WILL result in water damage if not already there.
Mine had damage at the side and bottom of the kitchen window that I beefed up with Great Seal on side (pinched between plywood and clamps till expanded fully and cured) and 30 minute epoxy thinned some to soak into the rotten wood at bottom.
Oh, everything on the roof needs to be resealed too. It took me a couple weeks of evenings but well worth it.
I live in AZ so on the rare nights it rains I often find myself sleeping in the rv just enjoying the sound and knowing there are no leaks.
Looking foreward to your updates and pictures.
Rick
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