As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH FLOOR STRUCTURE HAS 4EA AREAS WITH CORROSION. GROUNDED - YES. REMOVED CORROSION IAW B737-900ER SRM 51-10-02. NO LIMITS STATED. FABRICATED NEW WEB P/N 147A5116-19 IAW BAC DWG 147A5116 REV-. ALODINED IAW B737-900 AMM 51-21-41. PRIMED IAW B737-900 AMM 51-21-72. DRILLED TO FIT NEW WEB AND INSTALLED NEW WEB IAW B737-900ER SRM 51-40-05, 51-40-02 AND BAC DWG 147A5116 REV-.