Hi,
I just had the same issue last night for the first time. We had our FR3 since 2016, and had rain before, but never leaked on the corner of the slide out by the bed. I think it could be a mix of very strong winds, sideways rain storms, and the slide out stoppers on the cables outside which are loose exposing a hole that leads to the inside mechanism of the slide out. I went outside in the rain and plugged both holes top and bottom cables with plastic wrap, and it slowed the deluge to a trickle. I will re-glue the stoppers and put some silicone between wall and slide out in the bedroom.
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