As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION - BOTH BORES OF THE DSB UNDERWING FITTING AT NUMBER 4 NACELLE STRUT ATTACH AREA. ACCOMPLSHED BORING OF THE DUAL SIDE BRACE UNDERWING FITTING AT NUMBER 4. BOTH HOLES PER BOEING SB 747-54A2218 (FINAL HOLE DIA AFTER HONE = 2.2450). SUSPECT CORROSION RESULT OF COMBINATION OF HEAT IN SVCE & CONDENSATION IN NACELLE-PYLON AREA.