As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 2715 FROM IAH TO TOL. DURING CLIMB OPERATION WHEN RETRACTING THE FLAP FROM 5 DEGREES TO 2 DEGREES THE NR 4 L/E FLAP AMBER LIGHT REMAINED ILLUMINATED. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITH OUT INCIDENT. POST FLIGHT INSPECTION WAS PERFORMED. REMOVED AND REPLACED THE NR 4 L/E FLAP POSITION SWITCH, OPS CHECK GOOD. AIRCRAFT WAS RETURNED TO SERVICE.