As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE OIL FILTER MESSAGE DISPLAYED. MESSAGE DISAPPEARED WHEN THRUST REDUCED. TROUBLESHOT IAW MM 79-35-00-101 FIG 103. REMOVED AND REPLACED MAIN OIL FILTER. INSPECTED ALL CHIP DETECTORS. NO CONTAMINENTS FOUND. REPLACED DIFFERENTIAL PRESSURE SWITCH IAW MM.