As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT #2 ENGINE STARTER EICAS MESSAGE DISPLAYED DURING ENGINE START.AC RETURNED TO GATE AND MAINTENANCE GROUNDED AC CREW PERFORMED A SECOND ATTEMPT TO STAR RH ENGINE ENG STARTED SUCCESSFUL PER ENGINE RUN PROCEDURES AMM 71-00-00.MAINTENANCE RETURENED TO SERVICE ,