As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED MASTER WARNING BELL AFTER TAKEOFF WHEN GEAR LEVER RAISED. LOWERED GEAR HANDLE AND GOT TEXT, RAISED GEAR HANDLE AFTER 1 MIN. GEAR RAISED NORMAL. ALMOST LIKE SENSOR STUCK. VERIFIED SECURITY OF GEAR POSITION AND LOCK SENSORS. PERFORMED BITE TEST TO BOTH LGCIU LAST FLIGHT FAULTS SHOWED NO FAULTS. NO ECAM FAULTS NOTED. VERIFIED STRUT EXTENSION. OK TO CONTINUE.