As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDED DCA UNDER AMBER ALERT DUE TO LEADING EDGE SLAT PROBLEM. *S/D* AMBER INTRANSIT LIGHT ON NR 2 SLAT, OVERHEAD ANNUNCIATOR PANEL STAYS AMBER WITH SLAT DOWN AND LOCKED. SLAT INTRANSIT LIGHT ON FWD INSTRUMENT PANEL ALSO STAYS ON. RAN FLAPS THROUGH FULL CYCLE SEVERAL TIMES AND OPERATED NORMALLY. REPLACED NR 2 L/E SLAT PROX SENSOR S164 PER MM27-88-11. ALL INDICATIONS OPS CHECK GOOD.