As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ELECTRICAL SMELL AT THE REAR OF THE CABIN, DECLARED AN EMERGENCY AND RETURNED TO OMA WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT PER EMB AMM AND DETERMINED PACK NR 2 WAS AT FAULT AND PLACED ON MEL. A/C WAS THEN RETURNED TO SERVICE.