Should fresh water tank be patched or replaced?

I will say that IF you go into this with that attitude , you will get some resistance... You are already looking for a "big fight" in your words..
I have heard nothing but exceptional customer service from GD , and have learned over the years that the folks who START OFF with a bad attitude , most likely end with it also..

RELAX , give them the chance to make it right. And possibly without the big fight you are referring to.... Life's too short