What was found
LOWER FUSELAGE W/ W VERTICAL BULKHEAD STIFFENER CRACKED @ LOWER CHORD O/ B OF A/ C AIR EXIT EXHAUST STA 663.75 MKD ; / [01] REMOVED STIFFENER; [02] CORRECTING STEP 1; REMOVED STIFFENER AT RT W/W BULKHEAD STA 663.75 LOWER CHORD O/B OF A/C EXHAUST PER B737-700 SRM 51-40-02-0G-0.; LOCATED AND DRILLED NEW VERTICAL STIFFENER AT RT W/W STA 663.75 LOWER CHORD O/B OF EXHAUST REF B737-700 SRM 51-40-05-0G-0 AND DWG# 111A1000.; [06] VERIFIED STEP # 5; [07] OK TO INSTALL NEW ANGLE; [08] INSTALLED NEW VERTICAL STIFFENER AT RT W/W STA 663.75 LOWER CHORD O/B OF EXHAUST REF B737-700 SRM 51-40-02-0G-0 AND DWG# 111A1000.; [09] REINSTALLED GSE EXHAUST AT RT W/W STA 663.75 REF B737-700 SRM 51-40-02-0G-0.; [10] VERIFIED INSTALLATION OF NEW VERTICAL STIFFENER AT RT W/W STA 663.75 LOWER CHORD O/B OF EXHAUST REF B737-700 SRM 51-40-02-0G-0 AND DWG# 111A1000 AND VERIFIED REINSTALLATION OF GSE EXHAUST AT RT W/W STA 663.75 REF B737-700 SRM 51-40-02-0G-0.; [11] REMOVED AND REPLACED VERTICAL STIFFENER AT RT W/W STA 663.75 LOWER CHORD O/B OF EXHAUST REF B737-700 SRM 51-40-02-0G-0 AND DWG# 111A1000.