As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WXR FAIL AMBER CAUTION ON NAV DISPLAY ON INITIAL RADAR POWER UP. WXR FAIL CAUTION DISAPPEARED WHEN WE TURNED THE RADAR ON LATER IN THE FLIGHT. GROUNDED - YES. PERFORMED OPS CHECK IAW B737-9 AMM 34-41-00-710-801. NO FAULTS FOUND, OPS CHECK GOOD.