As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C22 CHECK DISCOVERED LEVEL 2 EXFOLIATION CORROSION ON LOWER SURFACE OF THRESHOLD SUPPORT ANGLE FROM BS 947 TO BS 967, BL 55R AND WL 207. CORROSION WAS REMOVED AND RE-WORK WAS FOUND TO BE OUT OF LIMITS IAW BOEING 737-300 SRM 53-60-15-1AI FIG 101. MAINTENANCE REMOVED AND INSTALLED NEW THRESHOLD SUPPORT ANGLE FROM BS 947 TO BS 967, BL 55R AND WL 207 IAW BOEING 737-300 SRM 51-40-02-0G FIG. 12.