What was found
ON GEAR RETRACTION, CREW RECEIVED A SLAT FAIL MESSAGE. RAN QRH, DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. LANDED AND TAXIED TO GATE WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT AND R & R THE RT OTBD SLAT HARNESS AND SKEW SENSOR IAW AMM AND OPS CHECKED GOOD. ACFT IS GOOD FOR SERVICE.