What was found
FLT JB907 JFK-ORD ON APPROACH TO ORD CREW DECLARED AN EMERGENCY FOR A "SLAT FAIL" CAS MESSAGE WHEN SELECTING FLAPS SLATS FROM ZERO TO 1. CREW ACCOMPLISHED QRH PROCEDURES AND LANDED UNEVENTFULLY. MX RETRIEVED CMC CODE 27811014ACE AND COMPLIED WITH AMM FIM 27-81-810-807A CONFIRMED RIGHT O/B SLAT 2/3 SKEW SENSOR TRIP. REMOVED AND REPLACED SKEW SENSOR AS PRECAUTIONARY AND ACCOMPLISHED ELECTRICAL RIGGING IAW AMM 27-83-01. PULLED SF-ACE FOR T/S AND RE-INSTALLED IAW AMM 27-53-02, FLAP SLAT OPS CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.