As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START L BLEED OFF EICAS MESSAGE WAS DISPLAYED BLEED SWITCH LIGHT ALSO ILLUMINATED. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. REMOVED & REPLACED #1 ENG PRSOV IAW B767 AMM 36-11-09. OPS & LEAK CHECK GOOD; PERFORMED LEFT ENGINE RUN IAW AMM 71-00-00; OPS CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE