It appears not much of anything is covered under the extended warranty! When you say wear on the roof, exactly where, i.e. where the window drop or around the supporting frame? I would question dealers ability if each time the replacement hood has been aligned & fitted correctly this many times and it still is defective. I am guessing you have had one of the master technicians review & undertake the fitment? These sorts of comments worry me as a 370 roadster owner. So far mine has been fine, but then the car is only used at weekends and covers about 4-5k a year, it is also covered and garaged, only cleaned with a hoover and light pressure hose. Do you both use them as daily drivers? If local try Slough WLMG HPC, the mechanics know their onions on Zed's and GTRs. Sorry hear this as it must really put a downer on the ownership of what for the most part is a fab car, it certainly would put me off another roadster.