As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A PRELIMINARY CHECK OF 6 OF THE NEW RHM40E SPARK PLUGS SHOWS RESULTS ALL OVER THE SCALE FOR CENTER ELECTRODE WOBBLE. ONE PLUG ONLY SHOWED NO MOVEMENT ON THE DIAL INDICATOR. THE OTHER FIVE PLUGS INDICATED FROM .002 THROUGH .0045 INCHES OF DEFLECTION...EASILY WITHIN THE VISIBLE RANGE.