2000 citation 9.2 grey water tank leaky its in the basement

I pulled the camper off the truck. Looks like a full sheet 4x8 and a partial sheet 14in x 48in. Looks like the sheets can be removed but due to end trim pieces and caulking I think my best bet is doing a small cut out. If it leaks again in the future then I won't have to pull the whole bottom sheet off again, besides that half the time the screws have stripped out the wood and I don't want to work on a 2500 pound camper that will be supported only by its lifting legs.