As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO DURING TAXING, THE EICAS MSG WXR FAIL WAS SHOWN. DURING MX REVISION, THE TRANSCEIVER & RADAR WERE DETECTED FAILED IAW AMM 34-42-00. THE WEATHER RADAR ANTENNA DRIVE UNIT WAS REPLACED IAW AMM 34-43-00 & AMM 34-43-11, TESTED CORRECT.