What was found
LT MAIN GEAR CAUTION AND WARNING (AMBER AND RED) LIGHTS CYCLED ON AND OFF 3 TIMES ON GEAR RETRACTION, BEFORE THE GEAR LIGHT PANEL WENT TO ITS NORMAL DARK CONFIGURATION. IAW PROCEDURE, GEAR WAS EXTENDED USING THE ALTERNATE GEAR EXTENSION CHECKLIST. LANDING UNEVENTFUL. FERRIED FOR REPAIRS. PEFORMED CHECK OF THE LT MLG PROXIMITY SENSORS, FOUND "LT GEAR DOOR CLOSED" SENSOR OUT OF LIMITS, IAW AMM TASK 32-61-00-280-801, RIGGED LT GEAR DOOR CLOSED SENSOR IAW AMM TASK 32-61-06-830-801. OPS TEST LANDING GEAR PRIMARY EXTENSION & RETRACTION SYS TASK 32-31-00-710-801, OPS TEST GOOD. RETURNED TO SERVICE.