What was found
(CAN) DURING CRUISE AT FL 140 AT IAS 280 KT GREEN LT AND RED LT MAIN LANDING GEAR INDICATION ILLUMINATED WITH LIGHT IN THE GEAR HANDLE. THE INDICATION WAS INTERMITTENT ON/OFF THREE TIMES. AFTER GEAR DOWN SELECTION AMBER LEFT DOOR AND RED LEFT MAIN LANDING GEAR INDICATION ILLUMINATED WITH LIGHT IN THE GEAR HANDLE. QRH APPLIED AND ALTERNATE GEAR DOWN INDICATION SHOWED THREE GREEN LIGHTS. ATC WAS REQUESTED TO PROVIDE STANDBY BACKUP UPON LANDING. PAX AND CABIN WERE UPDATED ON THE LANDING SITUATION. INVESTIGATION / ACTION LT MLG NR 2 DOWNLOCK SENSOR HARNESS PINS FOUND CORRODED AT FIREWALL CONNECTOR P 24.