As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLOOR BEAM AT STA 986 HAS CORROSION SPOTS AND SCRIBE MARKS BETWEEN RBL 45 THRU LBL 45 IN THE AFT CABIN. GROUNDED - YES. REMOVED CORROISON FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-70-51-1A-1 REPLACED FLOOR BEAM CAP IAW B737-800 SRM 53-70-51-2R-4W= 1 1/2 O= .150 R= .095 L= 2" D= .055.