As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD LAVATORY WASTE TANK LOGIC CONTROL MODULE/CONTINUOUS LEVEL SENSOR REFLECTED FALSE FULL TANK INDICATION. CALIBRATION OF LOGIC CONTROL MODULE/CONTINUOUS LEVEL SENSOR LOST. REMOVED FOREIGN OBSTRUCTION AND RECALIBRATED LOGIC CONTROL MODULE.