What was found
LOWER FUS.CENTER WING BOX STIFFENER CRACKED @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT MKD DOT 001 / [01] REMOVED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;[02] LOCATED AND DRILLED NEW STIFFENER IN REF SRM 51-40-02-0G-0;[14] REMOVED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;LOCATED AND DRILLED NEW STIFFENER IN REF SRM 51-40-02-0G-0;INSTALLED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;CAP-SEALED ALL FASTENERS AT LOWER FUS.CENTER WING BOX STIFFENER CRACKED @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SOPM 20-50-19 AND APPLIED TOP-COAT IN REF AMM 51-21-73-370-803;[15] CORECTION<BR>REMOVED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;LOCATED AND DRILLED NEW STIFFENER IN REF SRM 51-40-02-0G-0;INSTALLED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;CAP-SEALED ALL FASTENERS AT LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SOPM 20-50-19 AND APPLIED TOP-COAT IN REF AMM 51-21-73-370-803;[16] VERIFIED STEPS 13; 14R AND 15