As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH TO DCA SLATS FAIL EICAS CAUTION PRESENTED WHILE DESCENDING THROUGH 4000 SPEED WAS 210 KIAS COMPLETED AOM 1 SLATS FAIL CHECKLIST FLAPS WORKED PROPERLY. PERFORMED TROUBLESHOOTING IAW FIM 27-81-00 FOUND RT SLAT ACTUATOR NR 6 INDICATOR TRIPPED. RESET TRIP INDICATOR IAW AMM 27-81-09. PERFORMED OPERATIONAL CHECK OF FLAPS & SLATS SYS IAW AMM 27-50-00, OPERATIONS CHECKED GOOD, INDICATOR DID NOT TRIP.