I recently purchased a 2007 S-type. The metal trim around the front & rear doors is discolored as if oxidation of the metal has occurred. My brother-in-law has owned several BMWs and said this was a common problem with those vehicles. He says the discoloration is actually under the metal's clear coat and that there is no way to remove it...replacement is the only solution. He claims that BMW replaced the metal trim with this problem under its warranty. Two questions...has anyone found a solution using a certain type of cleaner; has anyone had the metal replaced under the Jaguar warranty? Thank you.