As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT RETURNED TO THE GATE FOR AN INTERMITTANT LAV FIRE WARNING INDICATION. MAINTENANCE INSPECTED AND REPLACED THE LAV FIRE BOTTLE, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 26-25-01. OPERATIONAL CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.