What was found
IN FLIGHT ENGINE SHUT DOWN WHILE AT CRUISE AT FL290, NR 1 ENG OIL BYPASS LIGHT ILLUMINATED. INSPECTED OIL FILTER, NO DEFECTS NOTED. REPLACED FILTER & RAN ENG, NO HELP. INSPECTED HARNESS FOUND FIREWALL CONNECTOR LOOSE. SECURED CONNECTOR & RAN ENG - OPS CHECK GOOD PER MM.