Took the master off, backside looked dry. For the heck of it, I put it back on to see if I could bench-bleed it. I could not seem to get the air out of it.

Friend is off to Autozone in my superior Mopar.

Also looked at the wheel cylinders/calipers/hoses. Everything looks clean and dry.

If it were leaking from the rear and into the booster, I should suspect engine vacuum would draw the fluid into the engine and burn it. This car has been throwing up either an EGR or O2 sensor code for a long time....