I have a 1988 560 SEL in great shape but just learned that the wires to the air pump clutch were disconnected and buried from sight. Connecting them I found that the air pump was seized. Mercedes in Canada quoted me $1500.00 for a replacement. The car runs great without it, but I would like to restore it to mint. Can the pump be succussfully taken apart and rebuilt or unseized ?? I would appreciate an answer prior to removing it.