Proper Protocol for “Complimentary Roof Inspection”

Thanks everyone for your feedback and advice. No, the RV Service Center in question is not nearby, and I will never go back to them.
I have already purchased a tube of Dicor self-leveling sealant, and will go ahead with the repairs.
Given the open holes in the sealant in the photos, what is the best method to prep and clean the damaged sealant before applying the new sealant?
And yes, from now on, I will be going topside at least once a year to inspect the roof and perform pro-active repairs.