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 FAIL "WX RADAR SYS EICAS" MESSAGE, WEATHER RADAR SYSTEM LEFT AND RIGHT STATUS MESSAGES AIRCRAFT RETURNED TO PHX, EMERGENCY WAS NOT DECLARED. ACCOMPLISHED ISS WEATHER OPERATIONAL TEST. CHECKED NORMAL PER AMM 34-42-00.