As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT WHILE AT CRUISE FL390 FOR APPROXIMATELY 15 MINUTES, THEY WERE UNABLE TO ADJUST THE LEFT POWER LEVER AS IT WOULD NOT MOVE. AN EMERGENCY WAS DECLARED AND AIRCRAFT WAS DIVERTED TO KELP. WHILE DESCENDING THROUGH FL220 THE LEFT POWER LEVER HAD COME LOOSE. CREW MADE A NORMAL 2 ENGINE APPROACH AND LANDING IN KELP. MAINTENANCE REPLACED THE LEFT AFT POWER LEVER CONTROL CABLE. RUN UP CHECKS WERE GOOD. AIRCRAFT WAS RETURNED TO SERVICE.