What was found
WIRES UNDER CAPTAINS SIDE YOKE SPARKED AND BEGAN TO SMOLDER. LOST PRIMARY TRIM, PULLED CIRCUIT BREAKER AND CONTINUED ON AUX TRIM. LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED THE WIRING, AND FOUND A BROKEN WIRE ON THE MAIN TRIM ON THE CAPTAINS SIDE YOKE. THE WIRE WAS REPAIRED, AND THE SYSTEM FUNCTION TESTED GOOD.