On Tue, 03 Jun 2008 20:03:53 GMT, Ray wrote:
Since posting I found the source -- a hairline crack in the tank.

Is that something I can seal with caulking, or should I replace the whole
thing?

Maybe use epoxy injection? Maybe you can use a plastic liner, glued in
place with holes for the water supply, tank bolts, and water outlet
and thus achive a complete kluge?

Just replace the damn thing. Is your time worth nothing?