As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE MAGNETO TIMING TO THE ENGINE, BOTH MAGNETOS, CHANGED FROM 25 DEGREES TO APPROXIMATELY 34-35 DEGREES OVER THE COURSE OF 93 FLIGHT HOURS SINCE NEW. BECAUSE OF WARRENTY TERMS, WE ARE NOT ALLOWED TO OPEN THE MAGNETOS TO SEE THE ACTUAL CAUSE OF THIS.