As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY CHECK- FLOOR STRUCTURE FR 84 CROSSBEAM HAS CORROSION ON TOP OF CROSSBEAM ADJACENT TO LH SEAT TRACK INBD FLANGE; Y=(-10.78"). CUT AND REMOVED 2 SECTIONS OF TOP OF CROSSBEAM ADJACENT TO LH SEAT TRACK AT FR84 DUE TO CORROSION OUT OF LIMITS REF. SRM 53-23-10/AD01. FABRICATED AND INSTALLED REPAIR PARTS PER ETD2020-170-005537 REV C