What was found
DURING "C" CHECK IN MIAMI, FL AT AVBORNE HEAVY MAINTENANCE DISCREPANCY AS FOLLOWS, N/R 3900 MAIN CABIN SEAT TRACK FLANGE OUT OF LIMITS BETWEEN FRAME 27 TO FRAME 33, LBL 57. REMOVED CORROSION FROM AREA MAIN CABIN SEAT TRACK BETWEEN FRAME 27 AND FRAME 33 LBL 57. FOUND OUT OF LIMITS PER A-300 S.R.M. 53-10-00. 2. FABRICATED NEW SEAT TRACK IAW A-300 SRM 53-10-10. INSTALLED NEW SEAT TRACK FROM FS 27 - FS 33 LBL 57 IAW A-300 SRM 51-10-40 AND 53-10-10. TREATED AND PRIME AND APPLY POLY WHITE PER A-300 SRM 51-40-10 AND A-300 51-40-12.