As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: BOTH WEATHER RADAR SYSTEMS INOPERATIVE SHORTLY AFTER DEPARTURE. CREW DECLARED AN EMERGENCY AND AIR INTERRUPTED BACK TO DFW. AIRCRAFT WAS OVERWEIGHT FOR LANDING. ACCOMPLISHED FIM DMC-B787-A-34-40-F2-A8A-421A-A. CYCLED CIRCUIT BREAKER'S ISS-L (AALA202111083541) AND ISS-R AND TURNED ON WEATHER RADAR LEFT AND RIGHT OPERATIONS TEST GOOD.