As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT WET AREA STA 967-987 RBL-16 INTERCOSTAL CORRODED ON UPPER FLANGE. GROUNDED - YES. REMOVED CORROSION, FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-70-51-1A-1. REMOVED AND REPLACED INTERCOSTAL IAW B737-800 SRM 51-40-02-0G-0. W= 1.5" O= .075 R= 0.65 L= 3.0" D= .010.