As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY CHECK- CF 3 CABIN FLOOR STRUCTURE RH INBD LONGITUDINAL SEAT TRACK HAS CORROSION AT FR82. CUT AND REMOVED SECTION OF FLOOR BEAM DUE TO CORROSION OUT OF LIMITS REF SRM 53-23-10/AD01. APPLIED SURFACE PROTECTION TO R/H INBD SEAT TRACK BETWEEN FR 81-84. PER REF ETD 2020-170-005453. SRM 51-23-06, CPM 51-25-00.