As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE WEATHER RADAR WAS TURNED ON & THE RADAR SCREENS WERE COVERED WITH STATIC. FLIGHT RETURNED & LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED THE RADAR ANTENNA ASSEMBLY, NO HELP. REMOVED BLOCKAGE INSIDE EQUIPMENT COOLING DUCT. SYS GND CHECKED NORMAL OPERATION CLOSED.