As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WX RADAR DOES NOT SEEM TO ACCURATELY DEPICT WX IN THE AUTO MODE. IT SEEMS TO BE WAY TOO SENSITIVE AND PAINTS/DEPICTS WX THAT DOES NOT EXIST. GROUNDED - YES. COULD NOT DUPLICATE. CW B737-900 FIM 34-43 TASK 801,802 AND 815. CLEANED AND OP TESTED FAN. OPENED TAGGED ONE CB. REMOVED RT FOUND TRACE DUST/DIRT IN WAVE GUIDE REMOVED TRACE. FOUND RACK EXTREMELY DIFFICULT TO FULLY ENGAGE RT. ADJUSTED ARINC PLUG IN RACK REMOVED TAG AND RESET CB. INSTALLED NEW RT AND TESTED GOOD REF B737-900 AMM 34-43-00-730-802-001.