As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MACHINED INTERCOSTAL BETWEEN FLOOR BEAM 947.5 AND 967 AT APROX. RBL 50 HAS CORROSION - UNDER AFT SIDE OF OUTBOARD LAV MOUNT - / INTERCOSTAL PN # 147A5660U22 ' 'REMOVED AND REPLACED RBL 50 INTERCOASTAL BETWEEN FLOOR BEAM 947.5 AND 967 IAW SRM 51-40-02