Doug, thanks very much for your insight.
The wiring diagram (from tiffin)I have shows #12. The junction box has #12 (white jacket) and runs about 24" and has a flat plug and changes to #14 (yellow jacket).
Like my response from service center late friday "#14 had been upgraded to 20 amps". These are short runs.
Doug I have sent you a private message on my fridge. Looks like it has spilled its guts with the yellow around boiler, need insight on removal, all screws removed, look like it is glued (or adhesive) in box under bottom rails.
Doug, thanks again for your insight.