What was found
EMERGENCY DECLARED FOR LE SLAT ASYM INDICATION. AT APPROXIMATELY 1500 AFE AND 160 KNOTS, WE WERE AT FLAPS 25 WITH NORMAL INDICATIONS. WHEN SELECTING FLAPS 30, THE LE SLAT ASYM EICAS MESSAGE APPEARED ALONG WITH THE LEADING EDGE DISCRETE LIGHT. WENT AROUND AND RAN THE QRH. LANDED NORMALLY WITH FLAPS 20. EMERGENCY DECLARED, AMM: 27-88--01-2 REMOVED AND REPLACED #6 SLAT SENSOR S287 REF AMM ABOVE. NO ADJUSTMENTS REQUIRED. OPS CHECKED GOOD A/C OK FOR SERVICE.