As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C1 & C2 INSPECTION IN LCQ, FWD CABIN FLOORBEAM FRAME 18 HAS CORROSION OUT OF LIMITS. MAINTENANCE CUT OUT CORRODED SECTION OF FRAME 18, FABRICATED AND INSTALLED NEW SECTION OF FLOORBEAM IAW MESABA EO A53168. A/C RELEASE DATE 4/29/04.