As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR DISPLAYS RETURNS WHEN THERE IS NOTHING THERE IN BOTH AUTO AND MANUAL MODE STARTING AT ABOUT 80 MILE RANGE IN MAP MODE IT SHOWS RETURNS AT ALL DISTANCES THAT DONT APPEAR TO BE TERRAIN. ACFT GROUNDED. REPLACED THE WEATHER RADAR R/T IAW AMM 34-43-41-000-801, AND -400-801, OPS NORMAL.