es: REFERENCE SB 737-35A1121. REVISION 1. DATED NOVEMBER 7. 2011 AND INTERTECI-NIOUE SE.S8MXP1/4-35-175. REVISION 2. DATED MAY 10. 2011. A REVIEW OF AIRPLANE MAINTENANCE RECORDS IS ACCEPTABLE IN LIEU OF THIS INSPECTION IF THE SERIAL NUMBER OF THE CREW OXYGEN MASK STOWAGE BOX UNIT CAN BE OONCLUSIVELY DETERMINED FROM THAT REVI