As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, LT ENGINE OIL FILTER STATUS MESSAGE ILLUMINATED. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE REMOVED AND REPLACED NR 1 ENGINE DIFFERENTIAL PRESS OIL SWITCH IAW AMM 79-35-01. OPS AND LEAK CHECKED GOOD. ACCOMPLISHED IDLE RUN OF NR 1 ENGINE IAW AMM 71-00-00. NO FAULTS PRESENT, ALL INDICATIONS NORMAL. AIRCRAFT RETURNED TO SERVICE.