As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADAR IN AUTO SHOWING PHANTOM RETURNS AT 80NM RANGE. NO WEATHER IN THE AREA. GROUNDED - YES. WXR SYS OPS TESTED NORMAL IAW AMM 34-43-00-710-802-001, CDS BITE NORMAL WITHOUT FAULTS MESSAGE IAW IAW FIM 31-62 TASK 801. UNABLE TO DUPLICATE DEFECT.