As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE REPLACING THE FLAP TRACK ASSY, A CRACK APPROX 2 INCHES IN LENGTH AND RUNNING THROUGH THE LOWER RIVET HOLES WAS FOUND UNDER THE IB FLAP TRACK. PROBABLE CAUSE IS FATIGUE. RECOMMEND THESE AC WITH MORE THAT 8,000 HOURS TT BE INSPECTED BY BORESCOPE OR OTHER ACCEPTABLE MEANS, AT THE REAR WING SPAR AROUND THE FLAP TRACK ATTACH AREA. (K)