As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI- LAVATORY SMOKE ALARM SOUNDED FOR SEVERAL MINUTES DURING CLIMB. NO SMOKE NOTED BY CREW. DEFERED AND PLACED ON RESCHEDULED INSPECTION, IAW MEL 26-7 A & B. AIRCRAFT RETURNED TO SERVICE. FAULT WAS LATER DEEMED TO BE CAUSED BY RESIDUAL OIL FROM APU.