As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK, MAINTENANCE FOUND THE RT AILERON RIB, PN-85740136-102, UNDER L/E PANEL 643HR FOUND TO HAVE CORROSION. THE RIB IN QUESTION WAS R & R WITH NEW REF SRM 51-42-35-02-01. AIRCRAFT REMAINS OUT OF SERVICE FOR COMPLETION OF CHECK.