As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH INTO DFW, SLAT EXTEND LIGHT DID NOT ILLUMINATE WHEN SLATS WERE SELECTED AND FLAPS AT 5 DEGREES. EXECUTED TO-AROUND AND RECYCLED FLAPS/SLATS. SLAT EXTEND LIGHT OPERATED NORMALLY. AIRCRAFT LANDED WITHOUT INCIDENT. LUBED SLAT 'T' DUCTS AND CYCLED FLAPS/SLATS SEVERAL TIMES. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.