Coursonb- hi, I found your post when searching for a resolution to the same issue. I realize this is an older post, but thought I’d try anyway. I just had the exact same thing happen with a Jacuzzi j245 tub. We just returned from vacation after a week and the cover was blown open. (During winter) all water, except for the center portion of the tub had drained and it was still running. I’m curious to know if yours required repair or if you were able to just fill it and run it as normal. Thanks so much!