As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - CREW REPORTED LAVATORIES WOULD NOT FLUSH IN FLIGHT. EMERGENCY DECLARED RETURNED MIA WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND SENSOR FAULT AND BLOWER MOTOR POPPING CIRCUIT BREAKER. REPLACED BLOWER MOTOR. SYSTEM GROUND CHECKED NORMAL OPERATION.