Timely post!! I have two yearly phases of maintenance, and one of them is in the month of January
! This phase includes inspection of calking, eternabond, basement door gaskets, and then a smaller list of mechanical items.
Last year, I elected to only do a visual of the skylight, as it is now under four out of our five solar panels. (4 are on rails, and span across the skylight.) I think this year, I'll unmount the panels over the top of the skylight, and do a more thorough inspection. The first year we after we bought the coach, I re-calked, and then also enternabond'ed the skylight seams on all sides except the curb of the roof. That was just re-calked, and from good visual access via ladder, was looking good last year.
Water will find away to get in. We have, and knew about it when I bought the coach, one small soft spot between the closet and the bed. I stopped the leak from around the slide area within a few weeks of purchase. When we replace the carpet, I'll cut out and repair the soft spot at that time.
Knock on wood, preferred over MDF(-
!), all of our windows are still water tight
Best to all,