Atwood water heater

Thanks for the advice. I was thinking pinhole or perhaps hard water deposits have let something loose and needs tightening. But as stated, I cannot find any connections leaking. I need to pull the tank as I have just drained it.

Would welding be useful or just buy a new tank. I am not a welder by trade and not sure of the cost pros and cons.

Thanks again everyone. Keep the greasy side down.