E BULLETIN MOS MSC APU - ELECTRICAL POWER - STARTERGENERATOR - MODIFICATION OF STARTER;GENERATOR. PN 286545-7 AND -9 - RECOMMENDED REPLACEMENT OF STATOR HOUSING ASSEMBLY. PN 6430800.4. SERVICE BULLETIN MOS MSC APU - AIRBORNE AUXILIARY POWER - 3.0 INCH DIAMETER SURGE CONTROL VALVE - INSPECTION OF THE CHROME CUSTOME