As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SLAT FAIL MESSAGE IN FLIGHT. CREW DECLARED EMERGENCY AND RETURNED TO FIELD. MAINTENANCE T/S TO LEFT T1 SKEW SENSOR PER EMB AMM. MAINTENANCE REMOVED AND REPLACED LEFT INBOARD SLAT T1 SKEW SENSOR PER EMB AMM AND OPS CHECK GOOD.