As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLEED ISLN VALVE EICAS MSG AFTER PUSH-BACK. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE FOUND LH ISOL VALVE LOCKOUT PIN IN THE LOCKED DETENTS. ROTATED LOCK PIN TO UNLOCK DETAIN AND FOUND SYSTEM TO OPERATE NORMAL IAW B767 AMM 36-11-04. AIRCRAFT RETURNED TO SERVICE.