What was found
AFTER GEAR RETRACTION RECEIVED RED GEAR UNSAFE LIGHT ILLUMINATION WITH UNSAFE LIGHT ILLUMINATED WITH GEAR UP. RAN ABNORMAL PROCEDURES AND RECEIVED RIGHT MAIN LANDING GEAR DOOR NOT LATCHED LIGHT MOMENTARILY THEN RIGHT MAIN LANDING GEAR DOOR LIGHT WENT OUT ACCOMPANIED BY RED GEAR UNSAFE LIGHT GOING OUT. THEN DURING DESCENT, RECEIVED ABOVE INDICATION AGAIN. COMPLIED WITH ADJ/TEST OF MAIN GEAR DOOR CLOSED PROXIMITY SWITCH. FOUND RIGHT GEAR DOOR PROXIMITY SWITCH TO BE MALFUNCTIONING. REPLACED GEAR DOOR CLOSED PROXIMITY SWITCH IAW DC-8 MM 32-60-00-2. COMPLIED WITH ADJ/TEST OF MAIN GEAR DOOR CLOSED PROXIMITY SWITCH AGAIN. SYSTEM OPS CHECKED GOOD. NO OTHER DEFECTS NOTED.