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 SURFACE CORROSION ON SKIN AT LAV SERVICE PANEL AS MARKED. REMOVED AND REPLACED WASTE DOOR SERVICE PANEL PER SRM AMM 53-03-62-440-801-A TW# TC2-7398 DUE 6-10-20. RESTORED SURFACE PROTECTION TO SERVICE DOOR SKIN PANEL PER SRM 51-23-04, 51-23-05, 51-23-06. A/C REMAINS IN CHECK.