I think some of this might be part of a roof repair. The spacing of the lines feel like they're either for patches in the roof seams (?)(I don't know how that roof was done) or for something like solar panels as was suggested in another post. The width of each line seems a little too wide to be anything besides that. BryanJay, you might be right about the electrical and ventilation work. It's probably time for some upgrades, especially if the new ride will need more power than SDatHC and BBoBH with the new features it's supposed to have.