I ended up finally getting a chance to see this one up close. Interior had been well-used by a family. Lots of stains that the poor detail guys couldn't get out. I was digging the all leather steering wheel. That was nice compared to the crappy wood one that's usually on these.
I made the technicians do a block test in front of me, and while they didn't hold it on there as long as I wanted, 5-10 minutes, the blue fluid didn't appear to change color - so I guess that passes. It did lighten up a little, but it certainly didn't change to yellow and didn't really move toward green, either.
During the test drive it drove pretty well, but the center diff lock was super slow to come unlocked. Usually had to reverse the drivetrain to get it out (both under 4HI and 4LO usage). Maybe it just needs to be exercised more, but on one test when I hit the button to lock going down a straight road at like 30 mph, it clunked real bad repeatedly and was enough to make me step away.
As soon as I told my salesperson the news he immediately changed his attitude toward me and called his coworker and said to call the next in line.
If it's someone on here, enjoy your truck. It's really not that bad but I'm picky.
From the rear driver side window (the heart is for all of you on this special day):
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