As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE A/C WAS OUT OF SERVICE FOR HEAVY CHECK. CORROSION ON FUSELAGE INNER SKIN DOUBLER FOR WASTE AND WATER BOX BETWEEN FR 88-89 S26R. REPAIRED AREA IAW E-175 SRM 53-23-60/REP 01. MAJOR REPAIR. A/C REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.