[Richard]

Really helpful info.

Would you comment if my own words on summarizing the situation are correct. The coach raises in the front when in travel mode. However it is tilted with the left side lower.

If you lower the coach all the way down manually, does the front come back to the same ride height and the same difference from side to side. When adjusting ride height valves, the best practice is to lower the coach below ride height and allow the coach to raise to ride height before measuring.This is because of the minor hysteris in the HCV. If done the other way, raise above ride height manually and let travel return to the correct ride height, the results will be inconsistent.

Are the slides in or out? With my slides out, the front side to side cannot overcome the weight of the extended slides.

How much difference in inches is there from the left to the right side on the front? On the rear?

You have a great grasp of how the system works. Debris in the solenoid valves or HCV can give you fits, but if the corner is raising, partial blockage would cause slow response but eventually the corner would come to the proper ride height. If there is any flow path at all the pressurize will equalize over time.