What was found
EMERGENCY DECLARED, NOSE GEAR WOULD NOT COME DOWN AFTER !0 MIN WITH GEAR HANDLE IN THE DOWN POSITION MANUALLY DEPLOYED GEAR EXT PER QRH. CENTER HYD SYSTEM ADP FILTER MODULE WAS FOUND TO BE BYPASSING NOT ALLOWING CENTER HYD SYSTEM ADP TO OPERATE PROPERLY, CENTER HYD ADP FILTER MODULE WAS REPLACED AND OPS CHECKED ON BARCODE T3F18E0086CVR. PERFORMED NOSE LANDING GEAR EXTENSION AND RETRACTION SYSTEM TEST 3 TIMES NOSE GEAR RETRACTION AND EXTENSION TEST PASSED ALL THREE TIME REF B767 AMM 32-34-00/501