1995 Fleetwood Tioga Montara - hot water tank leak

vtraudt wrote:
Leaking from behind pressure valve.

Sounds done then. Did you remove the pressure valve to see if maybe you can get a better look at what's going on? Sure sounds like a freeze-up. The pressure relief valve went bad on mine last year and I replaced it without issue - but it was leaking out the valve not behind it. Mine's 34-years-old and works fine.