What was found
PHX - AIR TURNBACK - FLT 416 - "C" - DURING CLIMB OUT OF PHX ENROUTE TO COS, WHEN THE FLAPS WERE RETRACTED THE NR 2 L/E SLAT TRANSIT LIGHT STAYED ILLUMINATED. PERFORMED THE QRH PROCEDURES AND LIGHTS REMAINED ON, VISUALLY CONFIRMED THE NR 2 SLAT NOT COMPLETELY FAIRED, NO ROLL WAS NOTICED. RETURNED TO PHX MAKING AN UNEVENTFUL LANDING. MX TROUBLESHOT AND REPLACED THE NR 2 L/E SLAT ACTUATOR. OPERATIONAL CHECKS AND INDICATIONS WERE NORMAL. TEARDOWN REPORT INDICATES THE FOLLOWING PARTS WERE WORN AND REPLACED; STRAP, PACKINGS, SCRAPERS, SEALS, TUBING, CAP RINGS, BACK UP RINGS, O-RINGS, SLEEVES, CAD PLATE, AND RETAINER. ALSO REPLACED WAS A DEFECTIVE SWITCH.