What was found
ATB - EMERGENCY DECLARED, APPROX 22,000 FT NR 3 OIL QTY SHOWED 1 IN AMBER BOX. AFTER RUNNING NON-ALERT CHECKLIST, NR 3 ENG PRESSURE STARTED TO DECREASE. LEVEL AT 26,000 FT RECEIVED LVL 2 ENG OIL PRESS LO. ENG 3 WAS THEN SHUT DOWN. FOUND NR NR 3 ENG OIL FILTER HOUSING MOUNT BOLT OUT OF CASE. REPLACING NR 3 ENG. FOUND THE NR 3 ENGINE MAIN OIL FILTER HOUSING STUDS LOOSE AND PULLED OUT. REMOVED MAIN OIL FILTER HOUSING IAW AMM 72-65-04-000-868. REPLACED ENGINE IAW WAN 3136145.