As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATHROOM SMOKE DETECTOR WENT OFF TWICE IN FLIGHT NO EICAS OR OTHER INDICATION OF FIRE.AFTER LANDING DEFERRED LAVATORY SMOKE DETECTION SYSTEM IAW ABX MEL 26-26-3-2 MX ACTIONS C/W PLACARD INSTALLED MBCB 08-30-2026. AND RETURNED A/C TO SERVICE.