What was found
MAD - FLT 741 EN ROUTE MAD TO PHL. THE EMERGENCY LIGHTS STAYED ON WHEN ARMED. THE FLIGHT RETURNED TO GATE WITHOUT FURTHER INCIDENT. EPSU 3R REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
MAD - FLT 741 EN ROUTE MAD TO PHL. THE EMERGENCY LIGHTS STAYED ON WHEN ARMED. THE FLIGHT RETURNED TO GATE WITHOUT FURTHER INCIDENT. EPSU 3R REPLACED.