What was found
SLAT FAIL EICAS MESSAGE IN FLIGHT WHEN FLAPS 1 WAS SELECTED. FLAPS O/O INDICATION. COMPLIED WITH QRH, DECLARED EMERGENCY, LANDED WITHOUT INCIDENT. R & R 2/3 SLAT SKEW SENSOR ON RT WING IAW AMM 27-83-01. PERFORMED SLAT CONTROL SYSTEM RIGGING IAW AMM 27-80-00. PERFORMED OPS TEST IAW AMM 27-80-00. OPS CHECK GOOD.