As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOOR SUPPORT INTERCOSTAL HAS 2EA CRACKS BETWEEN STA 277 AND 294.5 AT BLO IN THE UPPER SURFACE COMMON TO THE FLOOR BOARD FASTENER HOLES. CLEANED INTERCOSTAL, FOUND 100% OUT OF LIMITS. LOCATED AND DRILLED AND INSTALLED NEW INTERCOSTAL IAW BDWG 141A5410 REV V, SRM 51-40-02, SOPM 20-30-03 AT M/C STA 277 AND STA 294.5 AT BL0.