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I did get in contact with Richard Piotrowski, at the Mt-Whitney and vicinity board, and this is what he said:
I've started looking in to what would be required for me to upgrade the site
to the latest version of the message board software (the current version is
no longer supported) and put it up on a web hosting service. I'll let you
know when I get it back up again.
If the WPBSMB is any guide, it looks like he's spending an awful lot of time in the mountains, so it may be a while -- but if it were me, I'd be up there too!