As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AFTER SETTING TAKEOFF POWER, RECEIVED A WINDSHEER AHEAD WARNING. PERFORMED LOW SPEED ABORTED TAKEOFF. WEATHER RADAR THEN WENT INTO TEST MODE. RETURNED TO GATE. MAINTENANCE TROUBLESHOT PER FIM 34-43-00. COULD NOT DUPLICATE FAULT. PERFORMED SATISFACTORY OPERATIONAL CHECK PER AMM 34-43-00.