What was found
ETOPS SIGNIFICANT SYSTEM - APU DOOR SHOWS OPEN WITH APU IN OFF POSITION/ AUTO SHUT DOWN ON ECAM.// PERFORMED BITE TEST ON APU SHUTDOWN MSG OIL CONTAMINATION OIL CHIP DETECTION REMOVED AND REPLACED FILTERS, AND INSPECTED CHIP DETECTORS. MSG CLEARS DOOR ACTUATOR STILLS SHOWS OPEN. T/S PER A330 TSM 49-62-00-810-915-A FOUND ELECTRICAL CHIP DETECTOR (59KTS) TO BE AT FAULT. PER TSM STEP 4 A 1B. NO METAL FOUND ON CHIP DETECTOR. R/R CHIP DETECTOR 59KTS PER HALA330 AMM 49-91-00. NO HELP. T/S AND FOUND INTERNAL GEAR IN GEAR BOX DAMAGED. NEED APU CHANGE. REMOVED AND REPLACED APU PER TASK CARD 4901-9401-HAL, OPS CHECK NORMAL.