As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 4K INSPECTION IN LCQ, LOWER FUSELAGE TCAS ANTENNA DOUBLER HAS EVIDENCE OF CORROSION. REMOVED CORROSION, HFEC SKIN (CRACK FREE) FABRICATED TCAS DOUBLER, TREATED INSTALLED DOUBLER TOP COATED IAW MESABA EO S53203. REFER TO 409 NR 1258951 FOR FURTHER DETAIL. A/C RELEASE DATE 2/16/04.