As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING A MAINTENANCE (A1) INSPECTION EVIDENCE OF ARCHING AND DAMAGE WAS DISCOVERED AT THE L/H ENGINE FIREWALL AT THE DC FEEDER CABLES. AN RD FOR A PERMANENT REPAIR WAS REQUESTED AND RECEIVED FROM BOMBARDIER. THE AIRCRAFT IS CURRENTLY UNDER REPAIR. P/N: 85415031 S/N: PART CYCLES: 16545 TSN: 21460 TSO: NA A/C HOURS: 21460 A/C CYCLES: 16545 (TC# 20190226004)