As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT N508PH, A MD500E, WAS CONDUCTING A UTILITY FLIGHTS UNDER AN OAS CONTRACT AND PERFORMED A PRECAUTIONARY LANDING AT 21°35’ 10.9” N, 158° 00’ 44.7” W DUE TO SMOKE EMANATING FROM THE ENGINE. THE PILOT WAS THE ONLY OCCUPANT OF THE AIRCRAFT. AFTER LANDING IT WAS APPARENT THAT THE AIRCRAFT HAD SUBSTANTIAL OIL LEAKING FROM THE COMPRESSOR. AFTER CONSULTATION WITH AN ENGINE OVERHAUL FACILITY IT WAS DETERMINED THAT THE #1 CARBON SEAL INTERNAL TO THE COMPRESSOR SECTION HAD FAILED.