As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: #2 ENGINE APPEARED TO BE STUCK IN APPROACH IDLE DURING DESCENT. AT 13000 FT N1 IDLE WAS 43% ON ENGINE 2 N1 IDLE WAS 31% ON ENGINE 1. REPLACED FUEL TEMPERATURE THERMOCUOPLE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 73-35-15.