Found the cause of the diesel smell. Had the Coach into RV Services of VA in Ashland Va for Hydrohot service, in the course of the usual inspection, cleaning, etc. they found that i had a hole in my exhaust pipe. They did a hasty fix due to my inability to leave the coach with them to fix. They used JB Weld, we let it cure for 6 hours then ran the unit all night and it didn't leak. As a precaution we purchased a carbon dioxide detector for our bedroom.
I will raise the issue of exhaust pipe replacement in a separate thread.
2005 Country Coach Allure 470
2001 BMW 330 CI