As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, WHILE STARTING LH ENGINE, START VALVE LIGHT ILLUMINATED, NO ROTATION. A/C RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C. MTX DEFERRED IAW B767 MEL 80-00-2-1. MX PROCEDURES C/W MBCB 09/19/26. PLACARDS INSTALLED. A/C RELEASED ETOPS 180 AND RETURNED A/C TO SERVICE.