What was found
THE PILOT AND MEDICAL CREW REPORTED HEARING A LOUD BANG COMING FROM INSIDE THE ACFT. THE NOISE OCURRED AS THE PILOT WAS PULLING PITCH TO LIFT FROM THE DOLLY. HE IMMEDIATELY ABORTED THE TAKEOFF AND RETURNED TO THE DOLLY. THE ACFT WAS SHUTDOWN, THE DISCREPANCY WROTE UP IN THE LOGBOOK, AND MX WAS CALLED.