As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI WHILE STARTING #2 ENGINE THE ENGINE FAILED TO START, A/C RETURNED TO GATE (BTB) AND MTX GROUNDED A/C. MTX TROUBLESHOT AND FOUND STARTER HAD FAILED INTERNALLY AND STARTVALVE WAS STICKING OPEN. MTX REMOVED AND REPLACED RH START VALVE IAW AMM 80-11-01. AND REPLACED #2 STARTER IAW AMM 80-11-02 . BOTH OPS CHECK GOOD . RETURNED A/C TO SERVICE START VALVE PN 3291172-2 SN 1191C TSN 1564 TSO 1564 TSO 1564