As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI - FLIGHT 2206 - ON CLIMBOUT THE LAVATORY SMOKE DETECTOR SOUNDED. THE AIRCRAFT RETURNED TO FIELD. MAINTENANCE INSPECTED THE AIRCRAFT BUT WAS UNABLE TO DUPLICATE THE DISCREPANCY. THE AIRCRAFT WAS RETURNED TO SERVICE. NO PARTS WERE REPLACED.