What was found
CREW REPORTED, BURNING ODOR COMING FROM RELAY BOX UNDER GEAR PINS. MAINTENANCE PERFORMED VISUAL INSPECTION OF LEFT HAND POWER DISTRIBUTION PANEL, NO ARCING OR BURNED AREAS NOTED. FOUND FORWARD COOLING AIR DUCT DISCONNECTED, RECONNECTED DUCT AND APPLIED POWER TO THE AIRCRAFT FOR FOUR HOURS, NO ODOR NOTED. AIRCRAFT RETURNED TO SERVICE.