As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE POWER LEVER FROZE AT FL 330. FLIGHT DESCENDED TO FL 270 WHERE THE THROTTLE FREED UP. THE FLIGHT DIVERTED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE FUEL CONTROL ASSEMBLY WITH A SERVICEABLE UNIT. RUNUP AND LEAK CHECK WERE SATISFACTORY.