As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR IS MAKING RANDOM SWIPES ON THE SCREEN CONSISTANTLY AT ALL ALTITUDES AND ALL TILT SETTINGS. PERFORMED OPERATIONAL TEST OF THE WEATHER RADAR SYSTEM, IAW AMM 34-43-00-715. NO FAULTS DURING THE SCANNING OF THE RADAR OPERATIONS CHECK. "WXR TEST" MESSAGE SHOWN ON BOTH EHSI'S, OPERATIONS CHECK NORMAL.