As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CHANGING THE FLAP TRACKS ON THE LT WING 2 SMALL CRACKS, .2500 INCH LONG, EACH WERE NOTICED ON THE IB AFT WING SPAR AT THE IB FLAP TRACK ATTACH POINT. PROBABLE CAUSE IS FATIGUE. THIS IS A VERY HIGH TIME AIRCRAFT WITH OVER 12,000 HOURS TT. IT HAS ALSO BEEN USED AS A FLIGHT TRAINER FOR ITS ENTIRE LIFE. (K)