As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT IS IN C-CHECK WHEN INSPECTION FOUND EVIDENCE OF CORROSION AROUND SCREW HOLES AT LOWER SERVICE DOOR AT FRAME 20 AND FRAME 22. MX CLEANED FR 20 AND WAS WITHIN LIMITS. FRAME 22 WAS CLEANED AND A DOUBLER WAS INSTALL IAW EC 5310--01373. ALL WORK ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.