What was found
FL 340, 300 MILES OUT OF CYWG, HEARD LOUD BANG. L1 OUTER WINDSCREEN SHATTERED. SAW POSSIBLE ARCING AFTER IT SHATTERED, COULD NOT TELL IF INNER WINDSHIELD WAS DAMAGED. REMOVED AND REPLACED L1 WINDSHIELD PER MD-11 M/M 56-11-01-4. OK FOR SERVICE. PREMATURE REMOVAL/INSTALLATION OFF MFG NBA6045-501.