Thanks for the additional comments.
j-d, I really do mean I lack knowledge and am not a DIYer in auto mechanics. Well, I can check the oil and add some fluids :) I do appreciate your time and effort to educate me.
I wish I would have asked about this before I picked up my coach from the shop. Oh well, I'm sure I'll have another chance sometime to talk with a mechanic who is willing to delve deeper than this dealer. As noted, now I will know what to discuss and ask for.
bucky...Interesting idea about the code reader. I had to look all that up. I'm going to look for the plug outlet in the MH.