As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK DUE TO THE WEATHER RADAR FAILED DURING CLIMBOUT. FLT CREW REPORTED NO LRU FAULTS ALONG WITH MX FAIL FAULT. SUSPECT THE R/T UNIT THAT WAS INSTALLED LAST FLT LEG WAS BAD. REMOVED AND REPLACED THE TRANSCEIVER IAW AMM 34-43-01-404-005. SYS CHECKED GOOD IAW AMM 34-43-00-735-007-001.