As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED LEVEL 2 CORROSION ON THE WASTE SERVICE PANEL AND INTERNAL DOUBLER. MAINTENANCE PERFORMED MAJOR REPAIR. REMOVED AND REPLACED THE WASTE SERVICE PANEL (P/N 170-86668-403) DOUBLER (P/N 170-86655-003) AND DOUBLER (P/N 170-86654-003) IAW ETD2016-170-091265 REV A AND SRM 51-23-06, 51-10-03, 51-43-04 & AMM 38-32-50. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.