AGE 3 IMPROVED INNER BUSHINGS. VANES. SEALS AND SHROUDS. SERVICE BULLETIN MOS HRSI.ISC - ENC SB 72-0582 NO. I ENGINE - SPARE PARTS RELEASE FOR CFM.56-7B ENGINES. SERVICE BULLETIN MOS 07-AUG-2C06 HR&MSC - ENC SB 72-0582 R1 NO. I ENGINE - SPARE PARTS RELEASE FOR CFM.56-7B ENGINES. SERVICE BULLETIN MOS