Hi,
When I bought my 2014 it also had not had the upgrade,which shocked me since the owner was A**L about EVERYTHING...It took me about 6 months before learning about the Fuse-27 upgrade....and did have it done...I figure its CHEAP insurance...might blow,might not...but do you want to be stranded if it does........
I forget the part # but got mine off Ebay for around $25-$30....it can be done yourself if you have some mechanical skills....I do,but hate messing with electrical so brought to a local RV/Trailer place (dont need to have dealer do it)...its a 1 hr job and at time they charged me $75....
Bottom line...DO IT....