As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TROUBLESHOOTING INBOUND WRITE UP, IRU DC FAIL MSG. FOUND WIRE BUNDLE W0072, W0066, AND W0074 ALL CHAFING AND SHORTED AGAINST SUPPORT BRACKET BEHIND P6-1 PANEL. AS PANEL WAS BEING CLOSED THE LAST TIME, THE BRACKET SHORTED BUNDLE AND CAUGHT FIRE. FIRE IMMEDIATELY EXTINGUISHED BY AMT.