SAFETY WIRE HOLES AND REWORK OF THE PREVIOUS CONFIGURATION. SERVICE BULLETIN MOS HRSAMSC - ENC SB 72-0476 NO. 1 ENGINE -SPARE PARTS RELEASE FOR CRASS-7B IPC. SERVICE BULLETIN MOS HRS/MSC - ENC SB 72-0477 NO.1 ENGINE - INSPECTION OF NO.5 BEARING SUPPORT NIPPLE WELD. SERVICE BULLETIN MOS HRS/IASC - E