As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD - DURING ROUTINE MAINTENANCE, MX FOUND RIGHT OVERWING EMERGENCY LIGHT EXIT INOP. MX PROCEED WITH TROUBLESHOOTING AND FOUND INVERTER INOP. MX REMOVED AND REPLACED INVERTER AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.