What was found
WHILE ACFT IN HEAVY CHECK MAINT FOUND - MAJOR- WASTE SERVICE BOX DOUBLER TO HAVE EVIDENCE OF CORROSION,REMOVED AND REPLACE WASTE SERVICE BOX SKIN DOUBLER AT FR87-FR88,REF E175 SRM 51-40-08, RESTORED SURFACE PROTECTION REF. E175 SRM 51-23-04, 51-23-05, 51-23-06. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.