[B and C]

Sorry for the long post...  I'll try to be concise.  We were at HWH to get hydraulic manifold replaced.  When getting ready to leave coach raised to ride height but while driving the air supply would slowly drop to about 70 psi and stay there.  Pulled over and coach was down in the rear... fortunately there was no dragging or tire rubbing.  I had to pump the brakes while stopped to drop pressure to 40-50 psi before it would start to build pressure. Put it on fast idle and with added throttle up to 1600 rpm the air supply would raise to 115 or so psi and coach would be back to ride height.  Called Newell and spoke to Jim Raymond who thought it was the air regulator or governor.  Nursed it to Altoona Iowa and it is now at a Detroit diesel shop to be looked at tomorrow.  Any ideas would be greatly appreciated.

Thanks