What was found
CORROSION FOUND ON THE LOWER DRAIN FITTING ON THE LEFT FLEXIBLE FUEL CELL., P/N 501864-3 ( GD421-0101-7 LH. ). SEE ATTACHED REFERENCE . BD 700 AIRCRAFT IPC 28-12-13 ITEM 30. FOR CLARITY OF EXACT LOCATION OF THE FITTING WHICH IS A PART OF THE FUEL CELL SEE ATTACHED BD 700 AMM 28-12-13 "E" AREA OF FIGURE 401 ON SHEET 1 OF 4 AND SHEET 3 OF 4. THIS IS THE LOWEST POINT IN THE FUEL CELL AND THE FITTING IS EXTERIOR THAT THE DRAIN LINE ATTACHES. THE LIP OF THE FITTING IS SEVERELY CORRODED RENDERING THE FUEL CELL AS UNUSABLE.