What was found
AFTER DEPARTURE, RED INTRANSIT LIGHT A-SYSTEM DISAGREED WITH B-SYSTEM. CYCLED GEAR DOWN 3 TIMES, GREEN OK BUT WITH GEAR UP SAME RED INTRANSIT LIGHT REMAINED ON. RETURNED TO FIELD. CHECKED RIGHT MAIN A-SYSTEM PROXIMITY SENSORS. REMOVED LANDING GEAR SELECTOR HANDLE ASSEMBLY, PROBLEM STILL EXISTS. REPLACED LANDING GEAR RELAY BOX WITH A SERVICEABLE ONE, OPS CHECKS GOOD.