As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3087 - MISC/DE - DUE TO A METALLIC SMELL IN THE FLIGHT DECK AND AN ASSOCIATED BRAKE SYSTEM 1 ECAM FAULT. CREW DONNED MASKS FOR REMAINDER OF FLIGHT. MAINTENANCE FOUND BSCU C/B POPPED AND CONFIRMED SMELL ORIGINATED FROM BSCU. CORRECTIVE ACTION: REPLACED BSCU. AIRCRAFT RTS. (LP# 4182604)