As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O GOT UNSAFE GEAR UP INDICATION PROCEEDED WITH GEAR UNSAFE ILLUMINATED WITH GEAR HANDLE UP. CYCLED GEAR IAW WITH PROCEDURE STILL UNSAFE. VISUAL INSPECTION SHOWED ALL GEAR LOCKED. ACCOMPLISHED TROUBLESHOOTING PER SSM 32-61-00, FOUND SW S1-431 (HANDLE POSITION SW) CONNECTOR LOOSE. SECURED CONNECTOR AND ACP LANDING GEAR RETRACTION TEST SYSTEM OPERATED NORMAL.