As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR WILL NOT PICK UP PRECIPITATION. RETURN TO DEPARTURE. PILOTS REPORTED THAT THE WEATHER RADAR TESTED FINE, PAINTED THE GROUND FINE, HOWEVER, IT DOES NOT REGISTER EVEN EXTREME WEATHER PRECIPTATION AS REORTED BY ATC AT 12 O'CLOCK. MAINTENANCE REMOVED AND REPLACED THE WEATHER RADAR ANTENNA IAW MM 34-40-00. OPERATIONAL CHECK WAS NORMAL. OPERATIONAL CHECK FLIGHT WAS SATISFACTORY.