quick add on to this thread for you guys or potential searchers later on... just had the issue of my front left sagging over night.... dealer first claimed i needed a new compressor (which didnt seem right since it re-enflated the bag when the car starts). i denied the fix and continued with it... took it back in a month later, they rediagnosed it as a leak in the front aigshock... so that seemed feasible and i had them replace.... i get the truck home and wake up to the same f@#king issue! take it back, turns out they really think it was a faulty ride height sensor that doesnt cost much.... but somehow i still paid (out of warranty now) like $900 to put in a new airshock that i prob didnt even need......
moral is, dont trust the dealer for one but also do your homework and it seems like some of the suspension issues are a cheap easy ride height sensor fix...