As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN FLAPS 20 SELECTED ON ARRIVAL TE FLAPS DISAGREE EICAS ALERT. TE FLAPS STOPPED AT APPROXIMATELY 18 DEGREES. DECLARED EMERGENCY, ACCOMPLISHED QRH PROCEDURE, LANDED FLAPS 20. EMERGENCY DECLARED. REPLACED #4 FLAP TRANSMISSION DUE TO OVERLOAD & DRAINED AND FILLED NR 2 FLAP TRANSMISSION DUE TO WATER.