As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE START-UP, THE LEFT ENGINE FAILED TO LIGHT OFF. THE IGNITION SYSTEM WAS IMMEDIATELY SUSPECT DUE TO LACK OF 'POPPING' THAT ACCOMPANIES THE FIRING OF THE IGNITERS. THE EXCITER BOX WAS REPLACED AND THE ENGINE STARTED NORMALLY.