As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE WITH ENGINE PARAMETERS NORMAL A SERIES OF BANGS WITH ASSOCIATED DROPS IN TORQUE, RISES IN ITT AND DROPS IN FUEL FLOW. RATE OF BANGS AND FLUCTUATIONS DECREASED WHEN TORQUE REDUCED TO 1100 LBS AND STOPPED WHEN TORQUE REDUCED BELOW 800LBS. REPLACED ENGINE ASSEMBLY. TEARDOWN RESULTS OF REMOVED ENGINE PENDING.