As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPARK PLUGS WERE REPLACED BECAUSE OF WEAR. UPON INSPECTION OF NEW PLUGS, FOUND WIRE WRAPPED AROUND CENTER ELECTRODE ON TWO OF THE NEW PLUGS (WHICH GROUNDED IT OUT) AND ANOTHER SIX WOULD NOT TEST GOOD IAW CHAMPION TEST PROCEDURES. OBTAINED ANOTHER NEW SET OF PLUGS AND FOUND ONE LUG WITH WIRE AROUND CENTER ELECTRODE AND TWO OTHERS WOULD NOT TEST GOOD. BOTH SETS CAME FROM THE SAME BATCH OR LOT. LOT NR 4G99.