What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE LEFT FF SEAT TRACK BEAM CORRODED ON FRAME 19. MAINTENANCE REMOVED CORRODED SECTION, FABRICATED/INSTALLED DOUBLER FROM 2024T3.080, PO 000587-2012, FABRICATED/INSTALLED FILLER FROM 2024T3 .020, PO 000587-2012 AND FABRICATED/INSTALLED FILLER FROM 2024T3 .032, PO 024093-2011 IAW ETD 2012-170-008579. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.