What was found
DURING DESCENT OUT OF 28,000 AS THE POWER LEVERS RETARDED, THE NR 1 POWER LEVER STOPPED AT 78 PERCENT. CREW DISENGAGED THE AUTO THROTTLES AND THE NR 1 POWER LEVER WAS JAMMED, WOULD NOT RETARD. IT WOULD HOWEVER MOVE FORWARD. AS WE DESCENDED INTO WARMER TEMP POWER LEVER FREED UP. MAINTENANCE REMOVED NR 1 ENGINE POWER LEVER INSPECTION PANEL, INSPECTED DUAL LEVER CABLES. NO EVIDENCE OF MOISTURE OR CANTAMINATION NOTED, EXERCISED CONTROL CABLES-MOVED FREELY. PERFORMED AUTO THROTTLE SERVO CHECK AND RTS CHECK. SYSTEM OPERATES NORMALLY. UNABLE TO DUPLICATE DISCREPANCY.