Is there any access to the bilge in the galley. I have a smell I want to kill living under my galley . I can't believe that such a large portion of bilge is not accessible.
In looking at pics it looks like there's a hatch under the step. If you still have the parquet floor it looks like panels. Just an educated guess but I think you'll be able to reach in from the hatch and raise the panels from underneath.
I will have a look. I accidentally replied through email so if this is a repeat then pardon my boomerness.