Ouch! It is starting to sound a tad serious. I was thinking along the lines of taking off any covering strip, taking out the window, cleaning up, new sealant and seal and putting back the cover. There's two of us but it's not a job I'm going to relish if it's too techy. I do have a tame boat person up the river. He deals mainly with engines and other mechanicals, but his brother does refurb, so that might be the best option. But, I do have some Creeping Crack on order and I'll give that a go first. It's not a huge leak, there aren't torrents pouring in every time a cloud goes over, but it is noticeable. I have a good dehumidifier running so things aren't getting damaged. The fix is mainly to stop 'er indoors from moaning about the saucepans being wet again.