As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O'S RADIO ALTIMETER INOPERATIVE. AFTER TAKEOFF , F/O'S RADIO ALT STAYED AT 0' AND CONSTANT GEAR HORN AUDIO. GLD UNSAFE CAUTION MESSAGE. RAN QRH FOR GLD UNSAFE AND RETURNED TO FIELD. R & R THE NR 2 RADIO ALTIMETER TRANSCEIVER IAW AMM.