As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEATHER RADAR WILL NOT TURN ON; ONLY SHOWS TEST PATTERN. GROUNDED - YES. INITIAL EVALUATION, PERFORMED WXR BITE IAW B737-900 FIM 34-43 TASK 801. NO FAULTS. ALL OBSERVATIONS NORMAL. PERFORMED SYSTEM TEST IAW B737-900 AMM 34-43-00-730-802-001. TEST PASS. ALL FUNCTIONS WORK FOR CAPT AND FO, GOOD RETURNS FOR BOTH. NO MTX HISTORY PAST 30 DAYS.