As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: A STRONG ODOR LIKE BURNING WIRE THROUGHOUT THE ENTIRE PLANE, NO SMOKE SEEN; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT ORD. COMPLIED WITH JOB CARD 08L00021001. NO FINDINGS. PERFORMED PACK BURNOUT, PER AMM 21-00-01 DUE TO PREVIOUS LEFT HAND ENGINE REPLACEMENT MIC 2012429. NO ODOR SMELLED, NO FAULT FOUND.