What was found
LOWER FUSELAGE CENTER WING BOX VERTICAL BULKHEAD VAPOR BARRIER STIFFENER CRACKED @ LOWER RADIUS O/B OF A/C AIR EXIT EXHAUST DUCT STA 663.75 MKD DOT CORRECTION AT L/H SIDE<[01] REMOVED AND REPLACED STIFFENER @ LOWER FUSELAGE CENTER WING BOX VERTICAL BULKHEAD VAPOR BARRIER O/B OF A/C EXIT EXHAUST DUCT STA. 663.75 PER B737-800 SRM 51-40-05-0G-0 AND BOEING DRAWING NO. 111A1000;[02] VERIFIED STIFFENER REPLACEMENT B.S. 663.75 O/B OF A/C EXHAUST DUCT LEFT SIDE.