Originally Posted by novaplum
snip....but I don't want to have to cut open underbelly in wrong area or void any other future warranty concerns saying I tried to fix myself.
If you have your dealer access the black tank, make sure you inspect how they re-attached the cut-out underbelly section before you leave service center. Check for openings/gaps, and make sure they put enough screws w/flat washers back in.
Once a section is cut out, there are two ways to close it back up. First, using the same cut-out piece of underbelly, add some trim wood on the "backside" of the panels at the seams to screw the panels to (see pic below). Second, install a new larger piece of underbelly material overlapping the existing underbelly panel and screw into it (wood could be used for added screw backing).
The purpose of using the trim wood is to give the screws something thicker than the existing underbelly material to attach to.