What was found
WHILE IN HEAVY CHECK MAINT FOUND CORROSION ON LT OUTBD PAX SEAT TRACK APPROX FRAME 21. REMOVED AND REPLACE LT OUTBD SEAT TRACK AT FRAME 17-21 REF SRM 51-40-08. RESTORED SURFACE PROTECTION REF SRM 51-23-04, 51-23-05, 51-23-06. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.,