What was found
CREW NOTICED SMOKE AND FUMES IN THE CABIN AND COCKPIT. PILOT ELECTED TO DIVERT FLIGHT TO SUITABLE AIRPORT FOR LANDING. A/C LANDED WITHOUT INCIDENT. REMOVED CABINET AND PANELS AND FOUND LIGHT TUBE AT THE NR 2 RT WINDOW SHORTED AND MELTED. IN ADDITION ASSY WIRES, RECEPTACLES AND ADJACENT WALL PANEL WERE MELTED. END CAP CONNECTOR OF LAMP ASSY HAD COME LOOSE. THIS CAUSED AN EXCESSIVE HEAT CONDITION. NR 2 CABIN LAMP WAS REPLACED WITH NEW LAMP. AIRCRAFT HAS BEEN RETURNED TO SERVICE.