As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR IS DEPICTING A CONSTANT GROUP OF CELLS AT 11 O'CLOCK AND 120NM, 50NM IN DIAMETER, BUT THERE IS NO WEATHER. CELLS DO NOT MOVED. THEY SHOW IN BOTH WX AND WX+T MODES. GROUNDED - YES. UNABLE TO DUPLICATE, REMOVED & REPLACED WXR RT PRECAUTIONARY REF B737-800 AMM 34-43-41. OPS NORMAL.