As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C16 CHECK DISCOVERED GALVANIC CORROSION ON 4 BOLTS LOCATED AT THE LT INBOARD MID FLAP OUTBOARD CARRIAGE. THERE ARE NO LIMITS ON CORRODED BOLTS. MAINTENANCE REMOVED AND REPLACED THE 4 BOLTS FOR THE LT INBOARD MID FLAP, OUTBOARD CARRIAGE IAW BOEING SOPM 20-50-01.