What was found
MAIN CABIN FLOOR SUPPORT BEAM UPPER CHORD CORRODED AT STA.986.5. GROUNDED - YES. BLENDED CORROSION,ORIGINAL THICKNESS 0.015 IAW B737-800 SRM 53-70-51-0I-1REMAINING THICKNESS 0.110,REMOVED 0.040.OUT OF LIMITS IAW B737-800 SRM 53-70-51-1A-1REMOVED UPPER "T" CHORD LBL 50 - RBL 50 IAW B737-800 SRM 51-40-02.FABRICATED NEW "T" CHORD , SPLICE ANGLES , STRAPS, AND CORNER FITTINGS IAW B737-800 SRM 53-70-51-2R-4 ALTERNATIVE 1.ALODINED IAW B737-800 SRM 51-21-01.PRIMED IAW BOEING SOPM 20-41-02.INSTALLED NEW "T" CHORD, SPLICE ANGLES, STRAPS AND CORNER FITTINGS IAW B737-800 SRM 53-70-51-2R-4 ALTERNATIVE 1.