As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIC - MX DURING ROUTINE MAINTENANCE, MX FOUND LT & RT OVERWING EMERGENCY LIGHTS INOP. MX TROUBLESHOT THE PROBLEM AND FOUND EMERGENCY POWER SUPPLY NR 4 INOP. MX REMOVED AND REPLACED POWER SUPPLY AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.