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There is a plastic/ABS panel in the left/driver side bay that contains the water service and Gray and black water drains. Remove all the sheet metal screws and remove the access panel. Only the left and rear sides of the tank can be accessed here. Your dc powered water pump should be there also. Good luck.
I tried that but would have to cut sheet metal where the gray water drain goes thru. That is behind the rear wheels my leak is in front of the rear wheels.
It's unusual that a tank will leak unless it has been chaffing against something. Most tank leaks are at joints. Have you inspected all the possible entry inputs to the tank. A plumbing leak (p-trap or similar) will run down a pipe and appear to to a tank leak. You could use some food coloring in a bucket of water and pour it down the drain possibilities one at a time to eliminate them. Maybe have someone under the coach with a bright light at the same time.