I have a 2001 XKR Silverstone with about 20K miles. My warning light came on the other day and the car went into low speed operation. The dealer charged $577.03 to "repair" this problem that they said was a TSB and a known manufacturing defect. I protested, but so far haven't made any headway with them. The car has been service religiously since day one with this same dealer. Any input would be greatly appreciated.