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 CORROSION ON THE LT AND RT INBOARD SEAT TRACK AT FS 40 AND FROM Y765 TO Y-765. CORROSION WAS FOUND TO BE OUT OF LIMITS IAW AIRBUS 320 SRM 53-31-15 FIG 101. MAINTENANCE REMOVED AND INSTALLED NEW SEAT TRACK ON THE LT AND RT INBOARD SEAT TRACK FROM FS 36 TO FS 41 AND FROM Y765 TO Y-765..