As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INITIAL INSPECTION: CRACK ON INTERCOSTAL BTW STA 312 & STA 328 LBL 46 AT PASSENGER CABIN FLOOR STRUCTURE (CPAX). INTERCOSTAL BTW STA 312 & STA 328 LBL 46 AT PASSENGER CABIN FLOOR STRUCTURE (CPAX) WAS REPLACED PER B737-800 SRM 51-40-02-0G-0.