As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE FAILED TO START ON TAXI OUT. MANUALLY OPENED START VALVE. ENGINE DIDN'T ROTATE. REMOVED DAMAGED STARTER. DUE TO STARTER VALVE MAY HAVE CLOSED DURING START AND REOPENED. REPLACED VALVE ALSO AS PRECAUTION. STARTER AND VALVE REPLACED PER AMM.