As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE DETECTOR IN RIGHT LAVATORY GOES OFF INTERMITTANTLY. PLACED ON MEL, REFERENCE 26-7. DETECTOR DISCONNECTED, AIRCRAFT RETURNED TO SERVICE. MEL CLEARED ON 5/31 BY RECONNECTING SMOKE DETECTOR. PROBLEM IS WITH APU WHICH IS ON MEL (REF QXEA9700216 ODR).