What was found
(CAN) AFTER DEPARTING THE APU OVERSPEED LIGHT ILLUMINATED AND APU DID AN AUTO SHUTDOWN JUST PRIOR TO ETOPS SEGMENT. ACFT WAS DIVERTED FOR TROUBLESHOOTING AND REPAIR. PERFORMED TASK 49-30 TASK 802 APU OVERSPEED SHUTDOWN AND APU BITE PROCEDURE 49-60, TASK 801. CLEARED OVERSPEED FAULT CONDITION CURRENT STATUS MESSAGE 49-31175 FCU RESOLVER CIRCUIT OCCURRED. PERFORMED TASK 49-32, TASK 805 NO DEFECTS NOTED CLEARED MESSAGE. ALL WORK PERFORMED IAW CARS 571.11 DUE TO APU OVERSPEED AND MAINTENANCE MESSAGE 49-31175 ON H79198 AND FCU FAULTS REPORTED VIA ACMS TREND MONITORING, INSPECTION DEFECT T016454 WAS RAISED TO GET APU FCU REPLACED AS A PROACTIVE MEASURE. SDR WILL BE UPDATED WITH REMOVED FCU PN AND SN AND WITH ANY RELEVANT TEARDOWN INFORMATION FOR REPAIR SHOP.