ORD. SERVICE BULLETIN - NDT - OF WEB AT 1Y" CHORD STR 15L AND 15R (STR 5L TO 7L AND STR 5R TO 9R) MOS 10-SEP-2007 AFL 25000 (s) SB 737-53A1248 RI E (A) INSPECTION FUSELAGE - BODY STATION 1016 AFT PRESSURE BULKHEAD WEB- INSPECTION FOR WEB 2 CRACKS AT THE Y-CHORD. SERVICE BULLETIN - NDT - OF WEB