I double checked the Service Bulletin for the GSA 28 Autopilot Servos. The affected Servos are 011-02927-00 serial number 2PG015462 through 2PG016170 and 011-02927-10/11 serial numbers 5G9017349 and 5G9019731 through 5G9021528. Fortunately my servos are not affected. Yay!