As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RDAR PAINTS GHOST RETURNS ERRONEOUSLY DURING CRUISE IN AUTO MODE. MANUAL MODE APPEAR TO OPERATE NORMALLY. GROUNDED - YES. PERFORMED WX RADAR SYS TEST BITE REF V737-800 FIM 34-43 TASK 801, SYS TEST PASSED IN ALL SOURCE MODES. NO FAULTS FOUND AT THIS TIME. OKAY TO CONTINUE.