As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PWS FAIL ON TAKEOFF AND RADAR WHEN TURNED ON, CREATES A HEAVY LOW TONE VIBRATION FROM FORWARD OF THE INSTRUMENT PANEL. GROUNDED - YES. WEATHER RADAR SYSTEM BITE OPS NML. REF B737-900 FIM 34-43 TASK 801. WEATHER RADAR SYSTEM TEST OPS NML, REF B737-900 AMM 34-43-00-730-802-001, NO NOISES NOTED. GROUND VERIFICATION SUCCESSFUL.