As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADAR DISPLAYED FALSE RETURNS IN AUTO MODE. RADAR APPEARED TO WORK NORMALLY IN MANUAL MODE. GROUNDED - YES. PERFORMED GOOD OPS TEST OF WXR RADAR SYSTEM PER B737-800 AMM 34-43-00-710-802. PERFORMED GOOD SYSTEM TEST OF WEATHER RADAR SYSTEM PER AMM 34-43-00-730-802.