2004 Buick Rainier CXL AWD 4.2Li6 air suspension problem

[MaverickZ71]

It is my understanding that these models have auto-ride-height and auto-ride adjustment via airbag airsprings on the rear suspension only. My family has one of these SUVs (never towed anything or hauled anything more than luggage) that has apparently just developed a consistent slight sag of 2-3 inches on the right rear only. The air system does pump up at startup and the left rear is at original ride height. Is there a serviceable sensor for the right rear only, or if not, ideas on how to repair?

Edited August 14, 2022 by MaverickZ71

[asilverblazer]

Probably a leaking shock bag, or air line. There is no side to side leveling, one ride height sensor controls both bags, one compressor inflates both bags.