As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING START RUN-UP, VAR NR WOULD NOT SYNC ENG 1 AND 2. AT FLIGHT IDLE ENG 1 N1 78 AND ENG 2 N1 85. MANUALLY SETTING WOULD NOT REMAIN ONCE VAR NAR PLACED IN NORM MODE. AIRCRAFT RESET HAD NO EFFECT. REMOVED AND REPLACED TORQUE ADJUST BOX ASS IAW AMM 77-12-00, 4-2.