What was found
PILOT; ON DESCENT WITH WING LANDING LIGHTS AND NOSE LIGHT ON, ELECTRICAL FIRE WAS SMELLED & SEVERAL SECONDS LATER SMOKE WAS SEEN COMING FROM PANEL LIGHTS. LIGHTS WERE TURNED OFF AND NO MORE SMOKE SEEN. MX; DURING INSPECTION FOUND ARCING BEHIND NOSE LIGHT SWITCH. REMOVED LIGHT SWITCH (NOSE LIGHT) AND FOUND LOOSE TERMINAL AND POSSIBLE GROUNDING PROBLEM ON NOSE LIGHT SWITCH, REMOVED AND REPLACED SWITCH S1-9 (NOSE GEAR LANDING AND TAXI LIGHT P/N 8906K1269) IAW SWPM 20-20-03 OP'S CHECK NORMAL REF W/O 00177903 ITEM 6 FOR SDR.