What was found
AFTER TAKEOFF AND GEAR RETRACTED (FROM ILN TO MEM) THE RED GEAR UNSAFE LIGHT REMAINED ILLUMINATED ALONG WITH THE AMBER RIGHT DOOR LIGHT ON F/E'S PANEL. RECYCLED GEAR WITH NO EFFECT. PERFORMED AN UPLATCH CHECK AND ALL LIGHTS EXTINGUISHED WITH A NORMAL UPLATCH CHECK. CONTINUED FLIGHT NORMALLY. FOUND LANDING GEAR AND DOOR LATCH ROTARY SWITCH BAD. JIGGLING THE KNOB, THE LATCH LIGHT WOULD GO OUT AND COME BACK ON. REPLACED THE ROTARY SWITCH PER THE WIRING DIAGRAM AS REQUIRED AND OPS CHECKED THE GEAR POSITION WARNING PER DC8 AMM 32-10-00-2. OPS CHECKED GOOD.