What was found
(CAN) THIS ENGINE HAD APPROXIMATELY 16 MINUTES AFTER ENGINE OVERHAUL. THIS WAS ON NR 2 ENGINE THAT THE SPARK PLUG SEPARATED. WE THEN REMOVED ALL SPARK PLUGS IN NR 2 & NR 1 ENGINES AND REPLACED WITH CHAMPION, AND WHEN REMOVING SPARK PLUGS ON NR 1 ENGINE ANOTHER SPARK PLUG CAME VERY CLOSE TO SEPARATE. THE NR 2 ENGINE SPARK PLUG WHEN IT SEPARATED IT DAMAGED THE PITCH CONTROL (MELTED THE OUTER CASING OF IT) AND ALSO BLACKENED 2 IGNITION LEADS AND BLOW A HOLE THRU THE BAFFLE SEAL.