As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 6143 - IAD - FLIGHT CREW REPORTED ABNORMAL VIBRATION INDICATION ON ENG NR 1 AFTER TAKEOFF - ALL OTHER INDICATIONS WERE NORMAL. CREW PERFORMED AIR RETURN AND LANDED SAFELY. IAD MX REMOVED AND REPLACED NR 1 ENG ACCELEROMETER AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.