As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER TAKEOFF AT 1000 FEET UNABLE TO ENGAGE NAVIGATION AUTO THROTTLE STAYED IN TOGA AT 5000 FT WHEN THROTTLES RETARD, LANDING GEAR WARNING HORN ON STEADY. HORN STAYED ON UNTIL GEAR WAS EXTENDED. LANDING WAS BELOW MAX LANDING. WEIGHT CONTAINS RADIO ALTIMETER WAS NOT DISPLAYING ON TAKE OFF. MAINTENANCE REPLACED ANTENNA PER AMM 34-33-21 AND PERFORMED SUCCESSFUL OPERATIONS CHECK.