As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR AUTO MODE INOPERATIVE. LATER REPORTED AS WX RADAR - MANUAL TILT ON CAPTAIN'S SIDE AND F/O SIDE IS NOT WORKING PROPERLY. WITH ZERO MANUAL TILT SELECTED ON CAPT SIDE, ND DISPLAY SHOWS + 11M WITH -15 SELECTED ON KNOB, ND SHOWS 0M AND CAN'T BE TILTED DOWN ANYMORE F/O SIDE, 0 TILT ON KNOB GIVES +2M ON ND AND -15 ON KNOB GIVES -6M ON ND. AUTO SEEMS TO WORK FINE WITH -2A ON BOTH ND'S AT FL390. ACFT GROUNDED. REPLACED WXR CONTROL PANEL, REF TASK 34-43-91-400-801. WX RADAR CONTROL PANEL OPS NOMAL IAW SAME.