As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - AIR TURNBACK - FLT 620 - DURING CLIMB-OUT, CREW REPORTED LEFT INBOARD KRUEGER FLAP ILLUMINATED ALONG WITH AMBER LEADING EDGE TRANSIT LIGHT. CREW RETURNED TO PHX, AND ON RETURN, LIGHTS EXTINGUISHED. MAINTENANCE REMOVED AND REPLACED LEFT INBOARD KRUEGER FLAP ACTUATOR PER MM 27-81-31-004-001. MAINTENANCE ALSO FOUND NR 2 KRUEGER EXTEND PROX SWITCH OUT OF RANGE. AS A PRECAUTION, REPLACED BOTH LEFT WING KRUEGER FLAP POSITION SENSORS.