As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD-PEK AIR RETURN ORD ACCOUNT WEATHER RADAR OUTAGE. DURING CRUISE EICAS MESSAGES - THE WEATHER RADAR SYSTEM AND WINDSHEAR SYSTEM DISPLAYED. EMERGENCY DECLARED, AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS GROUNDED. REPLACED THE LEFT AND RIGHT WEATHER TRANSCEIVERS IAW AMM 34-42-02 AND LEFT INTEGRATED SURVEILLANCE SYSTEM PROCESSING UNIT IAW AMM 34-42-08. OPERATIONS CHECKED GOOD.