As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT AFTER ROTATION THE ACFT YAWED AND THE F/O CALLED POWER LOSS. THE POWER LEVERS WERE PUSHED FULL FORWARD AND THE N1 ON THE LT ENGINE WAS AROUND REMAINED AROUND 24 PERCENT. THE ACFT RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT WHERE MX REPLACED THE THE NR1 FADEC. ENGINE RUNS WERE SUCCESSFUL AND THE ACFT RETURNED TO SERVICE.