As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O GEAR RETRACTION RECEIVED 3 RED (UNSAFE) ON FWD PANEL & 3 RED ON CONFIG PAGE. COMPLIED WITH QRH. SAME RESULT. RETURNED TO DEPARTURE FOR UNEVENTFUL LANDING. FOUND NO CONTINUITY BETWEEN PINS A AND B OF THE GEAR HANDLE SWITCH. R & R GEAR HANDLE SWITCH. TEST GOOD. FINAL CLOSED.