As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORTED THAT DURING A DESCENT, NR 1 ENGINE TORQUE WAS AT 25 PERCENT AND NR 2 ENGINE TORQUE WAS AT 7 PERCENT. PULLED IN POWER TO INCREASE TORQUE ON THE NR 2 ENGINE. DURING PULL IN OF POWER, NR 2 ENGINE TORQUE DECREASED TO 1 PERCENT MOMENTARILY PRIOR TO MATCHING UP ALL PARAMETERS (TORQUE, NG, T5). RETURNED ACFT TO MX BASE. REPLACED THE NR 2 ENGINE.