Can we assume you've read the appropriate section in RAVE, and you're familiar with the workings of the EAS system?
That's step 1.
tilting/sagging is usually a result of an air leak.
Did you check that yet?
Generally, the OEM bags will start to develop some "cracks" at the foldover around 60K miles, depending on environment. They're kinda "fishmouth" looking things, and only open up right at the foldover; this means it'll leak at 1 height but not another.
Eventually, the rubber o-rings will harden and need replaced.
Rocking horse activity (the truck goes up and down on it's own, seemingly trying to find level) usually points at a dying or faulty driver module in the EAS system.
The airlines may have just worked loose and need reseated.
Get a windex spray bottle, dump out the windex, fill the bottle with water and some dish washing liquid (just a bit).
Liberally spray all the air lines and bags with your bubble juice.
If you see air bubbbles, you have a leak.
It takes longer to put the truck on jack stands than it does to swap an air spring.
Rebuilding the valve block takes an hour or 2, give it 4 hours start to finish if it's your first time.
1. Read RAVE.
2. Do bubble test.
3. Fix problem.
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