As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOOR SUPPORT STRUCTURE IS CRACKED AT STA 540 APPROX RBL2 (MARKED IN RED). GROUNDED - YES. REMOVE BACK ASSEMBLY IAW B737-900ER SRM 51-40-02. RECEIVED NEW PART #143A5240. PO#1082816.1. LOCATED AND DRILLED NEW PART IAW B737-900ER 51-40-05. INSTALLED FLOOR BREAK ASSEMBLY IAW B737-900ER SRM 51-40-02. REF AIPC B737-900ER 53-42-11-66.