Yes, fluids were all drained. However, having slept on it, I'm wondering if maybe I had 2 things going on:

1. Water managed to drain into the pan and I didn't notice. Very possible working "in frame" (especially for me)

2. Truck sat for 2 days, had a cold night, maybe just normal condensation blowing out the tailpipe (didn't really SMELL like antifreeze, but...)

Got work starting tonight, no time to work on it. Back Saturday morning, Easter Sunday, I think Monday I go buy 2 cases of cheap oil. Then drain the oil that's in it, refill with cheap, run it for a few, do final torque, drain, refill. If it's not a leak, that should fix things up. If it IS a leak? I'll figure it out fast enough.