As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED, ON GEAR RETRACTION, RECEIVED AN EICAS MESSAGE FOR THE EMERGENCY LIGHT NOT ARMED AND ELECT EMERGENCY ABNORMAL. RAN QRH AND RETURNED TO DEPARTURE UNEVENTFULLY. NO EICAS MESSAGES WERE ILLUMINATED AFTER LANDING. ALL AIRCRAFT ENGINE GENERATORS WERE OPERATING NORMALLY. NO CMC MESSAGES WERE PRESENT AT THE TIME OF DEPARTURE TO ENGINE SHUT DOWN. AIRCRAFT MAINTENANCE PERFORMED TROUBLESHOOTING IAW FIM 24-60-00-801-802-A AND REMOVED & REPLACED THE OVERHEAD ELECTRICAL CONTROL PANEL IAW AMM 24-00-01.