As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2260 - EWR - FLIGHT CREW REPORTED ENGINE NR 1 HIGH VIBRATION ON TAKEOFF. CREW PERFORMED AIR RETURN AND LANDED UNEVENTFULLY. EWR MX PLACED ITEM ON DMI FOR 50 FLIGHT HOURS. ACFT WAS APPROVED TO RETURN TO SERVICE. FURTHER TROUBLESHOOTING REVEALED VIBRATION COMING FROM AIR TURBINE STARTER. MX REMOVED AND REPLACED STARTER AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. DMI CLEARED. ACFT WAS APPROVED TO RETURN TO SERVICE.