As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ECAM SMOKE LAVATORY DET FAULT, SUSPECT LAV (AFT LEFT). A/C RETURNED TO LAS VEGAS. DETECTOR TAMPERED WITH BY PASSENGER. PLACED ON MEL 26-17-01, LOCKED OUT LAV. REMOVED AND REPLACED DETECTOR IN LAV D PER AMM CHAP 26, SYS CKS OK THROUGH CFDS.