As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING FLIGHT 3855 - THE EMERGENCY LIGHTS CAME ON UNCOMMANDED WITH BOTH SWITCHES IN THE 'ARM' POSITION. MAINTENANCE CLEANED THE PUSHBUTTON SWITCH ON THE FLIGHT ATTENDANTS PANEL AND VERIFIED NORMAL OPERATION OF THE EMERGENCY LIGHTS IAW ATR 42-500 JIC 33-50-00 AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)