As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SURFACE CORROSION ON SKIN AROUND PAX WINDOW FORGING STA 500 TO 520 AND S-20L TO S-22L. ALSO ON UNDER SIDE OF S-22L AND UPPERSIDE OF S-20L MAIN CABIN LT SIDE. REMOVED WINDOW AND FORGING PER 747 SOPM 20-50-01. REMOVED CORROSION ON FORGING AND FUSELAGE SURFACE PER 747 SRM 51-10-01 FOUND TO BE WITHIN LIMITS PER 747 SRM 56-20-01. REPLACED WINDOW FORGING PER 747 SRM 51-30-01.