As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TUL - FOUND CORROSION BULGE IN WING LOWER SKIN WING CENTER SECTION STATION 836 LEFT ABOVE PRIMARY HEAT EXCHANGE. PERFORMED REPAIR ON WING LOWER SKIN WING CENTER SECTION AT STATION 836 ABOVE PRIMARY HEAT EXCHANGER IAW BOEING 727 SRM CH 57-30-3 PAGE 5 FIG 9. (M)