As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX COMPARTMENT FLOOR STRUCTURE INTERCOSTAL BETWEEN STA 280 AND STA 400 AT BUTT LINE 14L HAS CRACKS IN 2 LOCATIONS ON UPPER SURFACE. GROUNDED - YES. REMOVED AND REPLACED PAX COMPARTMENT FLOOR STRUCTURE INTERCOSTAL UPPER CHORD BETWEEN STA 380 AND STA 400 AT BUTTLINE 14L IAW B737 800 SRM 51 40 02.