As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK MAINTENANCE FOUND FWD INTERCOSTAL FOR AFT DRAIN CORRODED FR 86/87 STR 27R/28R. REMOVED AND REPLACED FWD INTERCOSTAL FOR AFT DRAIN AT FR 86/87 BETWEEN STR 27R/28R PER SRM 51-40-08. RESTORED SURFACE PROTECTION PER SRM 51-23-26 CPM 51-25-00. A/C REMAINS IN CHECK.