well here is what the leak looked like.
not repairable as far as I'm concerned the top was ripped off when the other tank failed and was replaced by the insurance company this should have been done then but I failed to check that tank so I end up eating the repair.
I'm disappointed with the construction of Keystones holding tanks. cheesy tank construction.
all my other holding tanks from my previous RVs had a hard rubber tanks that a gorilla couldn't hurt. I guess that's what happens when you try to keep the weight down on RVs.