Jon,
You are welcome. I finally got to contribute something to the technical knowledge of the group. I did not do it alone, I did have help from others. It was a long trip home but we made it and learned something in the process - now if I could just remember where I put those slippers!
Greg,
There was no change in the differential pyro readings after the Service Tehcnician polished the exhaust pipe. I did notice something strange to me. That was he smacked the clamps serveal times in several different places. After a couple smacks he retightened the clamps. There were about three rounds of pipe banging then clamp tightening.