Ok, so here we gooo.....
I pulled engine bay fuses F3 and F26, 5amp and 20amp respectively at 4:40 yesterday. I measured 1 hour later, 3 hours later, then again this morning (15 hours later)
Time 0, 1hr, 3hrs, 15hrs
LF 19 3/8" - 19 3/8' - 19 3/8" - 18 7/8"
LR 20" - 20" - 19 7/8" - 19 3/8"
RF 19 1/2" - 19 1/2" - 19 1/2" - 18 3/4"
RR 19 1/4" - 19 1/4" - 19 1/8" - 17 7/8"
So, a couple thoughts.... I'm wondering how much of the 1/2" fall on the LF and LR is thermodynamic in nature? aka it was roughly 50 degrees out when I pulled the fuses, and about 38 degrees when I woke up. Would the temperature decrease cause the left side to fall that much? The RF appears to have fallen 3/4", which is greater than the left side, but it could be due to the greater strain of the RR dropping as much as it did.
There appears to be something wrong with the RR side, as it fell 1 3/8" overnight....even with possible thermodynamic reduction, that's distinctly greater than the other 3 struts. As I said above, the RF fell 3/4", which is 1/4" more than the left side....but if the RR was putting additional strain on the RF, that could account for the extra 1/4".
To answer a few questions, no, the fall rate doesn't appear to be linear in nature, at least not at first glance. There's a distinct possibility that the system stays up until the pressure decreases to a specific level, then it becomes linear....or more specifically , the leak is constant, but there's no fall until it reduces the internal pressure by several psi, then it actually starts to fall.
One other thing to note, as soon as I re-installed the fuses I heard the front valve block open up and begin to try and level the vehicle. So, in theory I can assume the leveling system was not functioning and the reductions are all from leaks and/or internal pressure reductions.
Anyone have any real world experience to add here? Unfortunately, I don't track the suspension enough to determine if it actually falls this much normally?
I should be able to pull the RR wheel on Tuesday and see if I can find any leaks in the system. I'll let everyone know what I find.
I'll say this....I've been focusing on the LF, it may be I've been looking in the wrong place....or I have/had more than one issue.