As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AME OBSERVED EXCESSIVE SMOKE FROM EXHAUST DUCT. ENGINE WAS OPERATING AT GROUND IDLE. NO SMOKE AT FLIGHT IDLE. BORESCOPE INSPECTION SHOWED SUBSTANTIAL CARBON DEPOSITS IN THE DOME AREA OF THE COMBUSTION LINER. BLACK DEPOSITS FOUND ON 2 FUEL NOZZLES TIPS, SECONDARY JETS, ENGINE REMOVED AND RETURNED TO DEPARTURE FOR ADDITIONAL INSPECTION/REPAIR.