Have not had time to post, but here is the final outcome. Installed two new Delco/Beru glow plugs (#1 & #2) and a new glow plug strap on the driver side (passenger side ok). Changed Oil and Filter while I had it in the shop along with a new Cat fuel filter. Been running it all week and everything seems to be good. Here a a few pictures of the plugs and strap. Not sure right now which came first, the stuck control relay or the burned glow plug Please chime in if you have any ideas.
2002 Duramax ext cab 2wd - all stock