What was found
LEADING EDGE SLATS 4 AND 5 FAILED TO RETRACT CAUSING SUBSEQUENT FLAP BYPASS VALVE ACTIVATION AND AIR RETURN. DFD DATA SHOWS THAT THEY NEVER MADE IT BACK TO THE MID EXTEND POSITION MET THE CREW AFTER AIR RETURN. THEY SHOWED ME THAT ALL LEADING EDGE DEVICES DID NOT RETRACT.SUSPECT THE RETRACT FUSE TRIPPED. SUGGEST WE FOLLOW FIM TASK 27-81-00-810-812. LEADING EDGE LOCKOUT PROBLEM. ACCOMPLISHED FIM 27-81 TASK 812 FAILED AUTOSLAT VALVE LEAK DOWN CHECK, ABOVE 40CC LEAKAGE RATE, REPLACED AUTOSLAT CONTROL VALVE REF 27-83-21-400-801 ACCOMPLISHED AUTOSLAT SYSTEM FUNCTIONAL CHECK REF 27-83-00-710-801 OPS CHECK GOOD NO LEAKS NOTED. ROTABLE PARTS CHANGE WAS INDICATED