Quick update here. My rig is now at the dealer for the 4th time this season fro the same issue--leaking grey tank. They repaired the initial issue noted above and each time claimed they tested the tank; however, i received it each time with the grey only 3/4 filled, not pushed to full capacity to adequately test for cracks.
Long story short, whatever occurred when the tank "dropped" has caused multiple fractures. The dealer is now cutting a hole in the bottom of my rig and removing the tank.
Will update when we get it back.