As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HEAVY CHECK FOUND MAIN CABIN LT AFT WET AREA FLOOR WEB ASSY LBL 8.5 FR 87 TO FR 88 HAS LARGE AREA OF CORROSION. MX REMOVED AND REPLACED WEB PN 170-65928-001 IAW SRM 53-23-10, ETD2011-190/01333 REV C. AC REMAINS IN IND FOR COMPLETION.