As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK AT AERO CORP, FOUND PASSENGER CABIN FLOOR BEAM LONGITUDINAL SUPPORT AT LBL 12 HAS CORROSION AT BS 310. REMOVED FLOOR SUPPORT AT LBL 12 IAW B 737 51-30-2 AND FABRICATED NEW FLOOR SUPPORT FROM 60-8004 15 INCHES BY 2 INCHES IAW B 737 SRM 51-30-2. TREATED AND PRIMED IAW B 737 SRM 51-10-2 AND MM 51-20-11. (X)