What was found
ON APPROACH, SMOKE FROM PEDESTAL AREA NEAR AUTO-PILOT CONTROLLER WITH ODOR. DONNED O2 MASKS, DROPPED PAX O2 MASKS. DECLARED EMERGENCY & LANDED WITHOUT INCIDENT, PAX EVACUATED. FIRE PERSONNEL INSPECTED, UNABLE TO FIND CAUSE FOR SMOKE & ODOR. AREA INSPECTED, NOTHING EXCEPT 1 WIRE CONNECTOR FOR ROLL TRIM FOUND LOOSE. PIN IN CONNECTOR REPLACED. ACFT POWERED UP & OPS IN HANGAR FOR 3 HRS, NO DEFECTS NOTED. ACFT RETURNED TO ORIG CONFIG & FLOWN ON OPS FLT CHK FOR 1 HR, NO DEFECTS NOTED. ACFT RTS. ACFT FLOWN 7.2 HOURS & 8 CYCLES, NO RECURRING CONDITION. DURING MAINTENANCE ACTIVITY, PERSONNEL FOUND A MELTED DROP-ISLE LIGHTING STRIP, WHICH MAY BE THE ROOT CAUSE OF PREVIOUSLY REPORTED SMOKE IN THE COCKPIT.