As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1235, BOS-MSP .' (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) ' DURING INITIAL CLIMB-WXR FAULT ON EICAS. INFO PAGE WX-4 BUS INOP. THE RADAR WOULD NOT PAINT RETURNS IN ANY MODE OR TILT SETTING; REMOVED AND REPLACED WEATHER RADAR RTA PER BD500-A-J34-41-01. OPS CHECK GOOD.'