As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AT 6000 FT WITH GEAR AND FLAPS UP GEAR WARNING HORN SOUNDED FOR APPROXIMATELY 2 SECONDS WITH THREE RED UNSAFE GEAR INDICATIONS. REPLACED ALL 4 RADIO ALTIMETERS ANTENNAS (AALA202511176584), (AALA202511170938), (AALA202511170218), (AALA202511179177)PER AMM 34-33-11. OPERATIONAL CHECKS GOOD.