It was the gas valve.
A word of caution, the three screws that hold the gas valve in place are very tight, not exactly self threading but definitely a friction fit. while trying install the screws in the new valve I had to really get a grip on the burner assembly, changing my grip for each screw. On the last screw I reached around and squeezed the igniter, and heard a depressing "crack". Needles to say, I had to wait a few days for the igniter to come in.
And Gene, Thanks for all the help!