Ted,

I cannot think of a single air leak that even approaches that cost to repair.

Having said that older coaches such as my 97 will be experiencing the leans which is air leaking somewhere within the complex leveling system so the coach tilts or droops. But.....given two days and all brand new valves, almost all of which will not be required, and the problem is solved. My guess is the valves will cost less than $2000.

The other potential leaks are the airbags. A generous amount of time is 12 hours, and $1500 worth of air bags and now you have a brand spanking new suspension and leveling system.

The only thing left are brake chambers. Less than $700 for parts and about 8 hours and the brake chambers are all brand new.

Maybe my gearhead brain is minimizing this, but except for bargaining purposes, those numbers are bogus and inflated and what I described above are real numbers. If you do the work yourself it sounds intimidating, but with normal tools and some time your total cost is parts, the prices which I gave are on the high side.