As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - INFO TO MAINTENANCE- FL380 1 1/2 HOURS INTO FLT. WEATHER RADAR 1 DISPLAYED MULTIPLE FALSE RADAR RETURNS IN CLEAR SKY CONDITIONS. GAIN ON AUTO. REPLACED RTU #1 (13SQ1) PER AMM 34-41-51. OPS CHK OK. REPLACED #1 WXR TRANSCEIVER (1SQ1) PER AMM 34-41-33. BITE TEST AND OPS CHK OK.