As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 1261 - ON CLIMB-OUT OF PIT, THE OIL FILTER BYPASS LIGHT FOR THE NR 1 ENGINE ILLUMINATED AT APPROX 11,000 FEET. THE CAPT SHUT DOWN THE NR 1 ENGINE AND RETURNED TO FIELD AT PIT. AN EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE CHECKED THE NR 1 ENGINE MAIN OIL SCREEN AND FOUND SCREEN TO BE CLEAN. REPLACED THE NR 1 ENGINE OIL FILTER BYPASS SWITCH. RAN ENGINE. LEAK CHECK AND OPS CHECK GOOD. (M)