As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3106 - AT TAKEOFF SETTINGS, THE CREW NOTED A POWER LEVER SPLIT WITH NORMAL POWER INDICATIONS. WHEN THE CREW SELECTED BLEED AIR, THE NR 1 TORQUE DROPPED 2-3 PERCENT WITH NO CHANGE TO THE NR 2 TORQUE. THE AIRCRAFT RETURNED TO DTW. MAINTENANCE REPLACED THE ENGINE TRIM PANEL ASSEMBLY. SYSTEM OPERATED SATISFACTORILY. (M)