As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN CREW SELECTED GEAR DOWN, THE LANDING GEAR CONTROL CB IMMEDIATELY TRIPPED. CREW EXTENDED GEAR AND LANDED WITH NO FURTHER INCIDENT. A CHAFED WIRE FOR THE GEAR DOWN MICROSWITCH WAS FOUND UNDER THE CABIN FLOOR BENEATH SEAT 4A. THE WIRE WAS GROUNDING ON A DEICE LINE. THE CHAFED SECTION WAS REMOVED, WIRE WAS RESECURED & CHAFE PROTECTED.