As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED ENGINE SURGE DURING DESCENT WHEN PULLING POWER LEVER BACK AND THEN LETTING IT GO. INVESTIGATION FOUND THE PL FRICTION LOCK SHAFT WAS BENT, WHICH CAUSED FORWARD PRESSURE ON THE PL ASSEMBLY WHEN IT WAS PULLED BACK. NEW PARTS INSTALLED.