As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(MTND) CORROSION IN RT FEEDER TANK BY ENGINE JET PUMP MOUNT AREA, FOUND ON INSP CARD ZL-621-01-1 FOR ZONE INSPECTION. THE CORROSION WAS LOCATED UNDER THE JET PUMP BETWEEN RIBS 4 RT AND 5 RT AND BETWEEN STIFFENERS 8 AND 9. POSSIBLE CAUSE WOULD BE WATER CONTAMINATED FUEL. RECOMMENDATIONS WOULD BE TO HAVE REGULAR FUEL TREATMENTS AND CHECKING TANK DRAINS FOR WATER.