As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR DEPICTED SIGNIFICANT WEATHER COVERING THE ENTIRE NAV DISPLAY FOR THE FIRST OFFICER DURING THE WHOLE FLIGHT, REGARDLESS OF SETTINGS USED. WEATHER TEST APPEARED NORMAL AND WEATHER DISPLAYED ON CAPTAIN`S SIDE APPEARED NORMAL. ACFT GROUNDED. REMOVED & REPLACED THE WEATHER RADAR R/T IAW AMM 34-43-41. OPS NORMAL. ON GROUND, VERIFIED THE WEATHER DISPLAYED ON CAPTAIN'S ND IDENTICAL WITH THE FIRST OFFICER'S ND WITH LIKE GAIN & TILT SETTINGS.