As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C4 CHECK DISCOVERED LEVEL 2 GALVANIC CORROSION LOCATED ON THE R1 LOWER SILL OUTBOARD ATTACH FITTING FROM FS 17 TO FS 19 AND AT STR 23R. NO CORROSION LIMITS AVAILABLE IN THE AIRBUS SRM. MAINTENANCE REMOVED AND INSTALLED NEW FITTING ON THE R1 LOWER SILL IAW AIRBUS 320 SRM 51-42-11 AND 51-72-11.