As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS SIDE ND IN WXR MODE SHOWS ERRONEOUS RADAR DISPLAY. SCREEN IS FILLED WITH GROUND CLUTTER RETURN IN AUTO MODE. GROUNDED - YES. PERFORMED OPERATIONAL TEST OF THE WXR SYSTEM IN REFERENCE TO B737-900 AMM 34-42-00. NO FAULTS FOUND, COULD NOT DUPLICATE FAULT. PERFORMED WXR BITE PROCEDURE IN REFERENCE TO AMM 34-43 TASK 801. NO FAULTS FOUND. OPS CHECK GOOD.