What was found
NUMBER 3 ENG EXPERIENCED OIL LOSS. OIL PRESS AT APPROX 10 PSI ON IDLE PRIOR TO SHUT DOWN. DUE TO WEATHER ACFT DIVERTED TO ALTERNATE, FLIGHT ARRIVED SAFELY. TROUBLESHOOTING IN PROGRESS. ENG HAD APPROX 1 GAL IN THE SYS & SERVICED APPROX 3 GAL. FOUND OIL SUPPLY LINE AT 1 O CLOCK POSITION OF THE EXHAUST. REPLACED OIL LINE, INSPECTED MAIN OIL STRAINER FOR CONTAMINATION, NO DEFECTS NOTED. RAN ENG, OPERATIONS NORMAL, NO VIBRATION NOTED. PERFORMED NORMAL ENG SHUT DOWN. INSPECTED ENG TAIL PIPE, NORMAL. OK TO PROCEED.