AND REWORK. SERVICE BULLETIN THE PANEL AND SUPPORT STRUCTURE REWORK MOS 72 (s) 12-JAN-2012 SB 737-53-1310 FUSELAGE - SKIN - CHEM-MILL STEPS IN CROWN SKINS AT SPECIFIED LOCATIONS - INSPECTION AND MODIFICATION RECOMMENDED . SERVICE BULLETIN MOS 20-OCT-2011 SB 737-53-1310 TABLE 1 PERFORM FUSELAGE - SK