As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT WHILE STARTING RH ENGINE, RH STARTER WAS INOP. A/C RETURNED TO THE GATE (BTB) AND MX GROUNDED A/C. MTX EXERCISED RH START VALVE AND PERFORMED OPS TEST ON ENGINE START VALVE IAW AMM 80-11-00. OPS CHECK GOOD AT THIS TIME. A/C REMAINS ETOPS 180. MTX RETURNED A/C TO SERVICE.