What was found
97-0136 NR 1 LOW OIL BYPASS LIGHT CAME ON AFTER TAKEOFF. NR 1 THRUST LEVER TO IDLE LIGHT OUT .30 SECONDS LATER LIGHT CAME ON AND STAYED ON. OIL PRESS 48 PSI OIL TEMPERATURE NORMAL. ENGINE SHUT DOWN AFTER 2 MINUTE WIND MILLING. REMOVED AND INSPECTED MAIN OIL FILTER. NO DEFECTS NOTED. INSTALLED NEW FILTER. REMOVED AND REPLACED LOW OIL PRESS SWITCH PER MAINTENANCE MANUAL 79-33-2. CHECKED WIRING NO DEFECTS NOTED. RAN NR 1 ENGINE PER JET RUN HANDBOOK. LOW BYPASS LIGHT OPERATIONAL CHECKS NORMAL. NO LEAKS NOTED. OK FOR SERVICE.