What was found
AIRCRAFT WAS OPERATING A PART 135 FLIGHT FROM KABI TO KDFW. DURING CRUISE FLIGHT AT APPROX 7,000 FT MSL NEAR THE BOOVE WAYPOINT, THE PILOT DETECTED AN ODOR CONSISTENT WITH SOMETHING BURNING. PILOT CLOSED CABIN VENTS TO DETERMINE WHETHER THE ODOR ORIGINATED WITHIN THE ACFT. APPROX 1 TO TWO MINUTES LATER, THE ODOR BECAME STRONGER, & PILOT OBSERVED A SMALL PUFF OF SMOKE COMING FROM BENEATH INSTRUMENT PANEL & DISCOLORATION IN AREA OF TURN-AND-BANK INDICATORS. PILOT NOTIFIED ATC, DECLARED AN EMERGENCY, INITIATED AN IMMEDIATE DESCENT, & DIVERTED TO KSEP. ACFT LANDED SAFELY. MAINT INSPECTED ACFT & DETERMINED THAT COPILOT’S TURN-AND-BANK INDICATOR WAS SOURCE OF SMOKE & OVERHEATING. ACFT WAS REMOVED FROM SERVICE. OPEN