As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: WEATHER RADAR FAILED IN FLIGHT I HAD WXR FAILED AND PXR FAILED AROUND 31000. DECESION MADE TO RETURN TO LAX. EMERGENCY DECLARED AND AIRCRAFT LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE ACCOMPLISHED WEATHER RADAR SYSTEM BITE TEST IAW FIM 34-43-00. TEST PASSED, NO FAULT NOTED.