As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED LIGHT SMOKE AND ODOR COMING FROM UNDER ACARS. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND A LOT OF DUST UNDER ACARS. CLEANED UNDER ACARS AND ACCOMPLISHED WORK CARD 21-96-01. SYSTEM GROUND CHECK NORMAL OPERATION.