Not sure of that floor plan but I was also able to remove my fireplace and get to a small leak under the tub/shower. Pretty common I would say.My fireplace is easy, just remove the trim piece and 4 screws and that's easy access to under the bathroom, water heater, furnace and everything on this side of the wet bay wall. Of course you can also go through the pass through if you are small enough and want to wrestle with all the excess wires and stuff.
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Chris & Donna
2014 Voltage Epic 3990, 600AH Lifeblue, 1895W Solar, 3K Magnum w/AGS, 3X Micro-Air ES
2018 RAM 3500 Laramie Sport Crew Cab 6.7 Cummins, AISIN 4X4 DRW 4.10 Long Bed Dually 2004 Sportster 1200c