[77newell]

An easy way to test what solenoids are activated at any time (Forest shared this with me) is to touch the center post of the individual solenoids with a steel screwdriver blade and the one(s) activated will produce enough magnetism that you will feel the difference.

I'm thinking that if this were my 93 coach (similar 6-pack but controls different) I would be focusing on the LR first and thinking the RF was just a symptom of the LR dropping (it's also nice that the rear 6-pack is easily accessible). One of two things is happening; 1) not enough air is supplied to get the airbag filled, or 2) air is venting (leaking) faster than the supply can produce (supply can come from either the "up" solenoid or the HCV depending on which setting the controls are in and assuming the solenoids are turning on properly. If it is #2 you should hear venting somewhere while trying to use either the HCV or the "up" solenoid.

There are a couple things I can think to do but not sure of the exact order of doing them. I would use a screwdriver to test that the solenoids are properly on and off according to the control switch positions in the cockpit. I would also think about bypassing the 6-pack entirely by hooking the HCV line coming to the 6-pack directly to the line going to the airbag an pressurizing the system and putting the cockpit switches in the travel mode so all other valves are positioned in this mode. If doing this and moving the HCV control arm up and down (don't get crushed) moves the axle up and down then the problem is in the 6-pack or its controls. If the axle doesn't appropriately then the HCV has a problem and needs replacement.

If the HCV proves OK then you have to focus on the 6-pack and the screwdriver test may provide a useful starting point.