As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR DEPICTED CELLS WHERE THERE WERE NONE AND DEPICTED NOTHING WHEN THERE WERE CELLS. USED IN AUTO AND MANUAL BOTH. AUTO SEEMED MORE INACCURATE. GROUNDED - YES. REMOVED AND REPLACED THE WEATHER RADAR TRANSCEIVER IAW B737-800 AMM 34-43-41.