What was found
(CAN) SLAT FAIL EICAS MESSAGE WHEN FLAP 1 SELECTED FOR LANDING. FLAPS SELECTED UP AND BACK TO POSSITION 1 IAW QRH PROCEDURE, NO FIX. EMERGENCY DECLARED, LANDED WITHOUT INCIDENT. REPLACED OTBD SKEW AT SLAT 3-4 IAW AMM 27-83-01, CHECK SERV.