As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE CHECK, CORROSION WAS FOUND OUT OF LIMITS ON I/B FLANGE OF SEAT TRACK AND STA 1030 TO 1070 LBL 48. REMOVED CORROSION IAW B727 511006. FABRICATED NEW SEAT TRACK PER SAMPLE FROM BAC 15207927178. TREATED AND PRIMED IAW B727 SRM 511002 AND MM 512002. INSTALLED IAW B727 SRM 513002.