As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON GEAR RETRACTION UNSAFE GEAR HORN GOES OFF UNTIL GEAR IS FULLY RETRACTED. PERFORMED OPS CHECK FOR LANDING GEAR INDICATION AND WARNING PER B747 MM 32-61-00. OPS CHECK GOOD. INSPECTED WIRING FOR PRIMARY ACT TILT PER WDM 32-61-12 AND 32-61-7, NO FAULTS NOTED. INSPECTED PRIM AND ALT LANDING GEAR LOGIC BOXES, NO DEFECTS NOTED. OPS CHECK GOOD.