What was found
AFTER DEPARTING, WHEN MOVING FLAPS FROM FLAPS 1 TO FLAPS UP, RECEIVED AN LE SLAT ASSYMETERY. EMERGENCY DECLAIRED, RAN QRH, RETURNED TO DEPARTURE. REMOVED AND REPLACED THE LT OTBD SLAT LOSS SENSING SWITCH IAW MM 27-81-42-4. ADJUSTED SWITCH IAW MM 27-81-42-5. ISOLATED THE INBD AND OTBD SLAT LOSS SWITCHES. MEGGED ALL WIRES IN WINGS AND FUSELAGE. NO SHORTS TO GROUND NOTED. ACCOMPLISHED AN ADJUSTMENT TEST OF THE OTBD SLAT LOSS SWITCHES IAW 27-81-42-5. OPS CHECKED GOOD.