Shuttle XPC replacement motherboard

They don't seem to be easy to aquire.

Got a Shuttle PC. Its been in a water accident, I couldn't *see* any
signs of water damage when I took the top off. Booted ok.

However when its been on for a couple of hours everything keeps
crashing. New memory didn't help.

Pulling the whole thing to bits revealed some traces of what might be
water residue on the bottom of the mobo (bloody sods law, if it had
flooded 2mm lower it wouldn't have been touched!)

I'm going to clean the bottom of the mobo, then if that doesn't work,
stuff it in the dishwasher.

Failing that (prace bets now!) anyone know where I can get a new mobo
for the case? Mobo code is FS59. Suitable mobo that can take quicker
CPUs would be nice too.