Hopefully I’ve uploaded the pictures now.
It’s the floor next to the Transom, small bubbles coming from underneath what looks like a part which cover the joins.
Looks pretty minor, I'd get it all clean and dry and lift up the offending tiny edge and get a blob of Stormseal in there. You could use a heat gun, solvent and lift more and do a two part glue job but overkill I think.
It does depend on how it was constructed somewhat. If the floor is fully constructed to hold pressure as a stand-alone item and then glued into the SIB... with that seam tape in your images intended to be constructional not to hold pressure then the actual leak in the floor could be a fair distance from its exit point.
However only one way to find out really and that's by Max's method or by applying a patch to overlap the area.