What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED LEVEL 2 CORROSION ON THE RT I/B SEAT TRACK BETWEEN FRAMES 23 & 34. MAINTENANCE REMOVED AND REPLACED THE RT I/B SEAT TRACK BETWEEN FRAMES 23 & 34 IAW SRM 51-40-02, 51-41-01, 51-43-02 & 51-43-03. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.