As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACFT IS IN HEAVY CHECK FOUND CORROSION. PASSENGER CABIN RT HAND O/B SEAT TRACK FR 74 - 85. REMOVED AND REPLACED PASSENGER CABIN RT HAND O/B SEAT TRACK FR 74-85 REF SRM 51-40-08, 51-23-06. ACFT REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.