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Here are the pages. I'm not super familiar with the 939, but it looks like blocking both sides of the seals, then pressurizing to 80psi and checking that no more than 10 PSI leaks out in 1 minute.

I'm not finding a refence to that tool for testing hub seals? This is the closest I found:

Ronman: Yes, you have it all correct, I was just wording the CTIS vent as describing the front hub vents

After digging though TMs and posts on here, found the two axle vents and the 2 hub CTIS vents all connect together and vent is located near the bellhousing vent. Verified that one by blowing into it and could feel the air compression(like blowing up a balloon), air flowing back tasted horrible...

Okay looked at the vent lines from the axle, both were completely blocked. Enough that when pulling the fill plugs, both rear axles let out a fairly significant hiss. Truck hasn't been driven for a few days.

Thanks for the info, I looked at the vent lines but didn't have time to follow their routing as it went up the frame rail to somewhere, so many lines there it will take a bit to trace.

Noticed a rear tire was down on pressure a bit so refilled to 80psi. Also replaced the quick release valve near the muffler as it was missing. Then after a drive, gear oil sprayed out of the discharge from the quick release valve on the forward rear axle(connected to the tire that was low)...