As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR AFTER SWITCHING TO MANUAL AND BACK TO AUTO REMAINED STUCK IN MANUAL ON FO SIDE. RETURNS WERE ALSO VERY INACCURATE UNTIL VERY CLOSE TO PRECIP. GROUNDED - YES. PERFORMED MULTIPLE GOOD OPS TESTS ON GROUND PER B737-900 AMM 34-43-00-710-802-001. PERFORMED MULTIPLE GOOD SYSTEM TESTS ON GROUND PER AMM 34-43-00-730-802-001.