As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE HAS CONTINUED TO HAVE ECU FAILS RELATED TO "PROP SELF TEST FAIL". THE PROP GOV HAS BEEN REPLACED 10 TIMES IN 366HRS. EACH TIME IT IS REPLACED IT FIXES THE ISSUE FOR SEVERAL DAYS BUT THEN COMES BACK AGAIN. THE ENGINE HARNESS HAS BEEN REPLACED, THE ECU HAS BEEN REPLACED. THE PROPS HAVE BEEN SWAPPED SIDE TO SIDE TO SEE IF THE ISSUE WOULD MOVE AND IT DID NOT AND REMAINED ON LEFT ENGINE. AT THIS TIME CURRENTLY DO NOT HAVE A SOLUTION.