As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD LAVATORY SMOKE DETECTOR ACTIVATED ALONG WITH BURNING SMELL IN FLIGHT. FLIGHT CREW PULLED ASSOCIATED CIRCUIT BREAKERS AND RETURNED TO MSP WITHOUT INCIDENT. MAINTENANCE RESET CIRCUIT BREAKERS. ALSO, REPLACED SMOKE DETECTOR AND BOTH BALLASTS IN LAVATORY AS A PRECAUTION. NO EVIDENCE OF SMOKE OR OVERHEAT CONDITION WAS APPARENT. AIRCRAFT RETURNED TO SERVICE.