Hi again with a tougher question. A couple of years ago we were coming home from a rod run towing our usual tadem enclosed trailer with car in and while coming down a step grade was using the pac brake. Once we reached the flats I turned the pac off but noticed the coach was struggling to make speed. What had happened was the brake had actually stuck. This went on for about 10 miles until we made the next small town. We drove around on a Sunday and about the time I was going to give up the coach started to run better. Slowly but surely it must of stopped retarding the cylinders and we were on our way. Today it doesnt do anything when the switch is flipped. My wife wants to take a trip over the Rockies and I know better than to attempt until this pac is fixed. Does anyone have any tips on something that may be relatively simple. I am pretty good with my hands and tools but do not profess to be a diesel mechanic. Maybe this is a big truck shop fix? Thanks in advance.