As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LEADING EDGE SLAT DISAGREE EICAS MESSAGE. ACCOMPLISHED QRH. FLIGHT RETURNED DEN LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND NUMBER 8 SLAT OUTBOARD ACTUATOR INDICATOR POPPED. REPLACED NUMBER 8 SLAT OUTBOARD ACTUATOR. SYSTEM GROUND CHECK NORMAL OPERATION.