As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AT APPX 6000 FT, LAVATORY SMOKE DETECTOR AUDIBLE TONE ACTIVATED. COMPLIED WITH E&A 2.42. NO SMELL OF SMOKE OR FIRE DETECTED. REMOVED FROM SERVICE. NO HISTORY. C/W OP'S TEST OF LAV SMOKE DETECTOR. NO DEFECTS NOTED. A/C OK FOR CONTINUED SERVICE. REF DHC-8 AMM TASK 26-12-11-710-801. RETURNED TO SERVICE.