Filled the MC with water, plugged one outlet with my thumb and blew into the other...bingo, found the leak. Dropped it off at a local radiator shop, owner told me that he'd try to patch it, but if not, he could recore if for around $200 - $250. Yeah, I know, that sounds expensive to you guys in the south and midwest, but take whatever you'd pay and bump it up by 40%, and that's what we pay in the NE.
Hopefully I can put this to bed in the next few days and deal with my locking-up brakes (see other post).
Thanks...
Chris