If it were mine, I'd save myself the trip and aggravation of dealing with a dealer. Carefully remove some of the old dicor with a plastic putty knife, add stainless screws where there is none, clean it carefully with acetone, mineral spirits or denatured alcohol (everybody has their theories and preference) maybe add some new dicor 501, let cure, cover from cap to roof with 6" eternabond.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.