As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE REMOVING RT WING FOR REPLACEMENT OF THE WING WALK SKIN FOR CRACKING OF A PREVIOUS REPAIR THE OTBD MAIN SPAR UPPER ATTACH BOLTS WERE FOUND TO BE CORRODED. ALL BOLTS WERE REPLACED USING NEW PN BOLTS LISTED IN THE CURRENT IPC. THE MM DID NOT INDICATE THE PROPER PN SINCE IT HAD NOT BEEN REVISED TO MATCH THE IPC. THE WASHER INSTALLATION ORIENTATION WAS NOT SHOWN IN THE MM SO THE ACFT MFG WAS CONTACTED TO PROVIDE WASHER INSTALLATION REQUIREMENTS.