As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PUSHBACK, DURING ENGINE START DID NOT HAVE N2 ROTATION. RETURNED TO BLOCK. STARTER AND TRANSMISSION TOWER SHAFT WAS REMOVED DURING TROUBLESHOOTING. DETERMINATION WAS MADE TO REPLACE ENGINE FOR RETURN TO SERVICE AND CONTINUE TROUBLESHOOTING STARTER AND TRANSMISSION PROBLEMS ON GROUND.