What was found
ENGINE CYLINDER NR 4 WAS EXPERIENCING INTERMITTENT MISFIRING. FOUND LT COIL WAS GROUNDING TO ITS MOUNT THROUGH A SMALL PINHOLE IN BOTTOM OF THE COIL CASE, ELECTROAIR STATED THAT IT WAS TESTED AND "THERE WAS NOTHING WRONG WITH IT". THE COIL WAS RETURNED AND A NEW COIL WAS INSTALLED, WHICH SOLVED THE MISFIRE CONDITION. WE CONNECTED A HIGH TENSION CABLE TESTER TO THE SUSPECT COIL AND OBSERVED HIGH VOLTAGE SPARKING EMANATING FROM THE PINHOLE AS DESCRIBED ABOVE. MY CONCERN IS THIS COIL WAS DETERMINED TO BE AIRWORTHY AND THE OWNER COULD HAVE SOLD IT IN THE USED MARKET.