As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION AND SCRIBE MARKS FOUND ON THE INTERCOSTAL BETWEEN 312 AND 328 BEAMS AT BL 12L. GROUNDED - YES. REMOVED AND REPLACED NEW INTERCOSTAL BETWEEN 312 AND 328 BEAMS AT BL 12L IAW B737-800 SRM 51-40-02-0G-0W= 1" O= .080 R= .069" L= 1" D= .011".