Looks like I got lucky. Once drained, I was able to put the support board back under it.
The only place it appeared to be leaking was out of a drain plug that appears to support hooking plumbing up on either side of tank. It was barely leaking. I took it out, put some Teflon tape on threads and reinstalled and seems to be fine.
So, assuming no damage was done to downstream plumbing, which I doubt, I think I dodged a bullet.
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