As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR RIGHT SIDE THAT CONTROL KNOB HAS BECOME UNCALIBRATED. IN MANUAL MODE, WITH THE KNOB ON THE 15 DEGREES DOWN SETTING, THE FO'S RADAR DISPLAY/ SHOWS 1 DEGREE DOWN. GROUNDED - YES. REMOVED AND REPLACED WEATHER RADAR CONTROL PANEL IN REFERENCE WITH BOEING 737-800 AMM 34-43-91. P