As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADAR UNRELIABLE, FLIGHT DIVERTED. WX RETURNS ERRATIC ON WXR DISPLAY. CREW COMMENTS: WX RADAR NOT PAINTING ACTUAL WX. REPLACED WXR TRANCEIVER PER MM. RELOCATED ACFT TO ORD SCENIC PAD AND PERFORMED AN OPERATIONAL TEST PER MM, SYSTEM PAINTED AND TESTED NORMAL.