What was found
WHEN WEATHER RADAR WAS SELECTED ON CAPTAIN`S OR FIRST OFFICER`S SIDE, A LOUD RUMBLING NOISE AND VIBRATION FELT IN THE FLIGHT DECK. AMBER WEATHER CODE & PREDICTIVE W/S FAIL ON DU. ACFT GROUNDED. COULD NOT DUPLICATE. DUE TO HISTORY, REMOVED, REPLACED, AND TESTED THE WEATHER RADAR R/T IAW AMM 34-43-41-400-801. ACCOMPLISHED A WEATHER RADAR SYSTEM TEST IAW AMM 34-43-00-730-802-001, TESTS PASSED, GROUND VERIFICATION SUCCESSFUL.