What was found
SFO - FLT 1539 - EN ROUTE MIA-SFO - DURING CRUISE, ALL EMERGENCY EXIT AND FLOOR LIGHTS ILLUMINATED FOR APPROX 30 SECONDS THEN WERE EXTINGUISHED BY RESETTING THE EMERGENCY EXIT LIGHTS AT FLIGHT ATTENDANTS STATION. SITUATION OCCURRED AGAIN DURING FLIGHT. LANDED SFO WITHOUT INCIDENT. SECURED CONNECTOR AT FLT ATTENDANT SEAT. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)