As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RDU FLT 274 EN ROUTE CLT TO BWI - DURING FLIGHT, THE MID CABIN SMOKE ALARM ACTIVATED. THE CABIN CREW REPORTED AN ELECTRICAL/SMOKE ODOR IN THE CABIN AT THE SAME TIME OF THE ALARM. THE FLIGHT DIVERTED TO RDU AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE. OK FOR SERVICE.