What was found
ON FLAP-SLAT RETRACTION AFTER TAKEOFF, THE YELLOW NIPS LIGHT REMAINED ON. IWA THE CHECKLIST, RE-EXTENDED SLATS-FLAPS, EXTENDED NORMALLY AND NIPS LIGHT WENT OUT. RETRACTED FLAPS-SLATS AND NIPS LIGHT REMAINED ON. UPON INVESTIGATION, THE RT SLAT HAS A WRINKLE IN IT. REMOVED DAMAGED RT WING SLAT AND INSTALLED REPAIRED RT WING SLAT. REF MM 57-503. PERFORMED OPS TEST OF RT WING ANTI-ICING SYS AND CHECKED FOR LEAKS AT TELESCOPIC TUBE CONNECTION REF MM 30-101. NO LEAKS NOTED.