As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WAS ENROUTE. CREW DETECTED AN ODOR OF SOMETHING ELECTRICAL BURNING. ELECTED TO DIVERT THE FLIGHT WITHOUT INCIDENT. MX DETERMINED THAT THE NR 1 IRU FAILED AND WAS THE SOURCE OF THE ODOR. UNIT WAS REPLACED AND THE ACFT WAS RETURNED TO SERVICE.