As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FS 520 FLOORBEAM WAS FOUND WITH 1 INCH TO 2 INCH CRACKS NEAR THE UPPER CAP FLANGE AT RBL & LBL 24 & 45. THE CRACKS WERE TYPICAL OF BAC S/B 737-53-1120. THE UPPER CAP WAS TRIMMED OFF TO REMOVE ALL CRACKS. A NEW CAP WAS FABRICATED FROM ALUMINUM EXTRUSION AND INSTALLED PER ER/A 087489-14, REV A.