As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MULTISCAN FUNCTION ON WEATHER RADAR DOES NOT DISPLAY CORRECTLY ON CAPTAIN'S ND. FO SIDE IS NORMAL AND APPROPRIATE FOR WEATHER CONDITIONS. BOTH SIDES DISPLAY CORRECTLY WHEN MANUAL MODE IS SELECTED. GROUNDED - YES. REF AMM 34-43-00/501, 34-43-91/401. COULD NOT DUPLICATE FAULT. FOUND CAPT SIDE GAIN DIAL BINDING WITH TILT, CHANGING BOTH. REMOVED AND REPLACED WX RADAR CONTROL PANEL, CLEANED BLOWER FAN ON R/T AS REQUIRED.