As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
KEEL BEAM FROM STA 540 TO STA 663 HAS NUMEROUS AREAS OF CORROSION ALL ALONG THE LOWER CHORD AS WELL AS THE LOWER 'WEB'. GROUNDED - YES. REMOVED CORROSION FOUND TO BE OUT OF LIMITS FROM STA 620 TO STA 663 IAW B737-700 SRM 53-00-12-1A-1. REPAIRED IAW B737-700 SRM 53-40-12-2R-1W=.750 O=.140 R=.119 L=1.00 D=.021.