As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL FILTER BYPASS LIGHT NR 2 CAME ON. OIL PRESSURE NORMAL 45-47 PSI. LIGHT WENT OUT AS THROTTLE REDUCED, BUT CAME BACK ON AT THE NEW SETTING. STAYED ON AT IDLE THRUST. SHUT DOWN NR 2 ENGINE AND RETURNED TO FIELD. SUPPLEMENTAL DATA UPDATE: A SMALL AMOUNT OF DEBRIS WAS FOUND IN THE OIL FILTER. REPLACED OIL FILTER AND BYPASS SWITCH AND CLEANED LP 5 AND LP 6 RESTRICTOR FITTINGS.