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. LEADING EDGE DEVICE 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. NO PART IN MEM 27-80-00-40. REMOVED NR 1 L/E SLAT ACTUATOR, STARTED INSTALLATION OF NEW ACT PER MM 27-81-032-4. REMOVED AND REPLACED NR 1 SLAT ACTUATOR PER AMM 27-81-032. OPERATIONAL, LEAK CHECKS GOOD. ALL FLAP/SLAT INDICATIONS NORMAL. OK FOR SERVICE