The dealer and regional rep want to try a leak repair. I've reluctantly agreed. The repair looks like a epoxy smear at the leak location. I must admit it's a very good color match! I will monitor the results in around town driving for a while before I head out for an extended trip. I did get the key words casting porosity in the written diagnosis of the problem. Thanx for the input.
2002 Chevy 2500HD LS D/A CC SB 4X4 Summit White Med. Gray Leather, Stretch Tailgate Extender, Kodiak Sidewinder Retracting Steps, PowerGate tailgate lock, Line-X under rail, Lucerix X-Mount Mirrors, American Racing Pythons 16X8 Chrome, Michlein LTx 285 75R 16\'s, Rancho 4.5", Fumoto, Valentine 1