As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH RADAR IN AUTO, CA ND DISPLAYS EQUIVALENT OF MANUAL RADAR & SET AT APPX. 4 DEGREES DOWN TILT. IN MANUAL MODE, BOTH CA AND FO DISPLAYS ARE NORMALLY FUNCTIONING. GROUNDED - YES. PERFORMED OPS CHECK OF WEATHER RADAR SYSTEM. NO FAULTS FOUND, COULD NOT DUPLICATE FAULT. DUE TO HISTORY, REMOVED AND REPLACED WEATHER RADAR RECEIVER/TRANSCEIVER AS PRECAUTIONARY IN REFERENCE TO B737-900 AMM 34-43-41. OPS CHECK GOOD.