As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADAR TEST BUTTON STUCK IN DOWN POSITION. TEST BUTTON WILL NOT COME UP WHEN PRESSED. UNABLE TO TURN ON RADAR. ACFT GROUNDED. REF AMM 34-43-91, REPLACED DEFECTIVE WEATHER RADAR CONTROL PANEL WITH SERVICEABLE UNIT. GROUND VERIFICATION CHECKS OK.