As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADAR ON FOR APPROX 4 HRS GOT 'WX FAIL" & "PWS FAIL" AND RADAR FAILED. WENT TO TEST LATER BACK TO 'WX/ON" RADAR DISPLAY RETURNED TO NORMAL IN ALL MODES WARNING LIGHTS STAYED OFF. ACFT GROUNDED. WEATHER RADAR TESTED GOOD. PAINTS TARGETS NORMALLY.