What was found
DURING SB 737-53-1287-01, TWO CRACKS WERE FOUND AT BS 727D, LBL 1 - RBL 1, WL 148.5. LBL CRACK IS 1.13 INCHES & RBL CRACK IS 1.42. HF ANTENNA AND HARDWARE WERE REMOVED IAW SRM 51-40-02 AND SB 737-53-1287. PERFORMED CUTOUT IAW DWG 65C37049-3 AND SB 737-53-1287. PERFORMED HFEC INSPECTION IAW B737-53-1287, PG 139, STEPS I, M, AND N. NO DEFECTS. FABRICATED REPAIR DOUBLER & TRIPLER IAW SB 737-53-1287. PERFORMED HFEC INSPECTION, NO DEFECTS. FABRICATED, LOCATED, & DRILLED IAW DWG 65C37049, REV ORIGINAL AND SB 737-53-1287, REV 1. INSTALLED REPAIR IAW SRM 51-40-02 AND SB 737-53-1287 & DWG 65C37044.