I had the same leak in our #8351 Sun Voyager, though on the driver's side. My electrical compartment would fill to the top of the compartment lip, whether traveling or stationary, during every rain. This compartment is directly below the front of the slide and my driver's side door as well.
It was successfully sealed under warranty. Unfortunately, what was done is a closely held secret by the service department, though as a hint, they indicated that massive quantities of expanding foam insulation was used or re-applyed. I believe they used a pressure test of sorts to confirm the results.
I could not determine the source of the leak myself.
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