What was found
AFTER TAKEOFF WHILE RAISING FLAPS NR 1 LEADING EDGE DEVICE REMAINED EXTENDED AT 2 DEG AND 0 DEG FLAP SETTING. RAN QRH PROBLEM REMAINED. RETURNED TO BASE FOR NORMAL LANDING. LED RETRACTED ON SCHEDULE AFTER LANDING CLEAN UP. VISUAL INSPECTION OF NR 1 LEADING EDGE FLAPS SHOWS NO FAULTS. CYCLED FLAPS AND LEADING EDGE SLATS THRU SEVERAL TIMES ALL INDICATIONS CHECK GOOD. NEEDS FURTHER TROUBLESHOOTING. T/S TO BAD SLAT ACT. REMOVED & REPLACED NR 1 SLAT ACTUATOR PER AMM 27-81-032, OPERATIONAL, LEAK CHECKS GOOD. ALL FLAP/SLAT INDICATIONS NORMAL. OK FOR SERVICE