As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR DOES NOT ACCURATELY DISPLAY ACTIVE WEATHER IN AUTO MODE. APPEARS FUNCTIONAL IN MANUAL MODE ONLY + AUTO MODE UNDER 40 NM RANGE. GROUNDED - YES. PERFORMED WEATHER RADAR OPERATIONAL TEST REF B737-9 AMM 34-41-00-710-801 OPS CHECK NORMAL UNABLE TO DUPLICATE ON GROUND. AS PRECAUTIONARY, REPLACED WEATHER RADAR CONTROL PANEL REF AMM 34-41-53/401 ALL REQUIRED TESTS PASSED.