As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR UNUSABLE IN AUTO TILT SHOWS TOO MUCH RED WHICH SEEMS TO BE EXCESSIVE CLUTTER. MANUAL TILT IS BETTER BUT STILL LOTS OF CLUTTER SYS TEST NORMAL. GROUND CLUTTER SUPPRESSION BUTTON DOES NOT STAY IN WHEN SELECTED GC. GROUNDED - YES. REMOVED AND REPLACED WEATHER RADAR DRIVE UNIT REF AMM 34-43-11. PERFORMED OPERATIONAL TEST OF WEATHER RADAR SYSTEM REF AMM 34-43-00-710-802-001, ETOPS GROUND VERIFICATION SUCCESSFUL.