L BRACKET ASSEMBLY REDESIGN. SERVICE BULLETIN MOS 21-NOV-2011 HRS/MSC - ENC SB 72-0879 RI NO.1 ENGINE - GENERAL (72-00-00) - INTRODUCTION OF A NEW ACCESSORY GEARBOX ASSEMBLY (AGB) WITH NEW HOUSING ASSEMBLY AND NEW STARTER DRIVE PAD ASSEMBLY AND REWORK OF THE OLD AGB TO THE NEW ONE. SERVICE BULLETIN 12-APR-2012 SB 72-