As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR NOT PAINTING ON LEFT HALF OF SCREEN. RIGHT HALF OF SCREEN PAINTING EXTREME WEATHER THAT DOES NOT EXIST. DEBRIEFED CREW STATED ACTUAL BAD WX WAS ON THE LEFT SIDE OF A/C BUT WX RDR SYS SHOWED WX ON RIGHT SIDE OF A/C. MY BOEING FLEET AHM SHOWS MX MSG 34-43901. REF FIM 34-41 TASK 821 REMOVED AND REPLACED WX RDR PROCESSOR AND REF MM 34-41-42-400-801. SYS GND ADD EMP:U391770 CHKS GOOD.