I have a 2002 HR Endeavor that currently has the warning light on, and is in the shop. I checked all fluid levels prior to taking it in and they also verified. I also have a scan gauge, and they checked as well, it is not throwing any codes. It is at a diesel truck shop that I have been using for several years, honest people that I trust. I do NOT trust any of the local RV places they have proven themselves otherwise. We are not sure where to go from here. Any ideas since it isn’t throwing any codes?