Thanks guys! I got the headers pulled, and the seals all looked great, but one has some slimy black around it which I think is liquified graphite showing that it had been leaking a bit. Found & fixed the cause for that and remembered that when Summit sent my original set of Earl's gaskets two of the seals were smashed, so they replaced the whole gasket set. I pulled one seal from that set and replaced the one leaker. Should be good to go.