What was found
(CAN) AFTER GROUND CREW HAD CONNECTED AC POWER THE RH AC CONTACTOR BOX AREA BEGAN TO EMIT SMOKE AND VISIBLE ARCHING. MAINTENANCE DISCOVERED THAT A 20GAUGE AC WIRE CONNECTED TO A CURRENT LIMITER HAD CONTACTED THE CURRENT LIMITER HOUSING AND CHAFFED THROUGH CAUSING THE ARCHING. THE WIRE HAD MELTED AND THERE WAS OTHER DAMAGE CAUSED TO THE CURRENT LIMITER ASSEMBLY AND LIMITERS THEMSELVES AND SURROUNDING WIRES. THE AIRCRAFT IS CURRENTLY UNDER REPAIR. P/N: DSC201-20-9 S/N: NA TSN HOURS: NA , CYCLES: NA TSR HOURS: NA , CYCLES: NA A/C HOURS: 69958 A/C CYCLES: 74155 (TC# 20190410016)