As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE FROM KTHU TO KBWI THE CREW REPORTED LEFT AFT CABIN SMOKE DETECTOR ALARM AND POSSIBLE SMOKE SMELL. CREW DECLARED EMERGENCY INTO KBWI, LANDING UNEVENTFUL WITH NO ADDITIONAL PRECAUTIONARY ACTIONS REQUIRED. AIRCRAFT GROUNDED FOR UNSCHEDULED MAINTENANCE. WORK IN PROGRESS