What was found
UPON TAKING THE ACTIVE RUNWAY AND CLEARED FOR TAKEOFF, THE AIRCRAFT TAXIED OVER A BUMP. A LARGE NOISE WAS HEARD AND AN UNSAFE INDICATION OF THE LEFT GEAR OCCURRED. THE AIRCRAFT LISTED TWO DEGREES TO THE LEFT, TAKEOFF WAS ABORTED. THE GEAR WAS PINNED AND THE AIRCRAFT TAXIED BACK TO THE GATE. FOUND THE LEFT GEAR OUTER CYLINDER FRACTURED AT THE AFT TRUNNION BEARING JOURNAL. INCIDENT IS UNDER INVESTIGATION.