As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER L ENGINE START LEFT GEN DRIVE DISC SWITCH LIGHT REMAINED ILLUMINATED. L GEN OFF AND L GEN DISC EICAS MESSAGE. AICRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE DEFERRED L/H GENERATOR PER MEL 24-00-1-3. MX PROCEDURES COMPLIED WITH. PLACARD INSTALLED. MBCB 22 APRIL 23. AIRCRAFT RETURNED TO SERVICE.