As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON APPROACH THE CREW SELECTED SLATS TO GO OUT AND GOT A FAIL MESSAGE ON EICAS. POST LANDING INSPECTION REVEALED THAT THE LT SLAT PARTIALLY DEPLOYED AND THE RT SLAT WAS STOWED. MAINTENANCE CREW FOUND THE RT TORQUE TUBE DISCONNECTED FROM THE SLAT POWER DRIVE UNIT. THE COUPLING BOLT NOT ENGAGE THROUGH THE PDU SHAFT. NO DAMAGE WAS FOUND ON THE SYSTEM AND SURROUNDING STRUCTURE. BOLT RE-INSTALL IAW MM AND AIRCRAFT RETURNED TO SERVICE.