As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE THE ACFT WAS IN HEAVY CHECK MAINT FOUND RH SEAT TRACK IS CORRODED BETWEEN FRAMES 17 AND 18. REMOVED CORROSION BY BLENDING BACK FIRST LUG, MATERIAL BLENDED AWAY IS .750", DISTANCE TO CENTER OF THE SEAT TRACK ATTACH POINT IS 4.5" ON RH SEAT TRACK BETWEEN FRAMES 17 AND 18 RBL 12"S R1-10-03. REPAIR ON RH SEAT TRACK FRAMES 17 AND 18 IS WITHIN SERVICEABLE LIMITS REF. ETD 2018-170-114132. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.