As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR FAILED, IN TEST MODE PWS FLAG INDICATION. WHEN SELECTING ANY SELECTION SWITCH, A NOTICEABLE VIBRATION WAS HEARD AND FELT. DETECTED AND REJECTED WITH SAME RESULTS. TRIED RADAR AGAIN AFTER APPROX 5 MINUTES,THEN WEATHER RADAR OPERATED NORMALLY. ACFT GROUNDED. CLEANED COOLING FILTER IAW FIM 34-43 TASK 805. NO HISTORY LAST 30 DAYS. OPS CHECKED OK IAW AMM 34-43-00.