As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4083 THE CREW REPORTED A SMELL OF SMOKE IN CABIN AT THE GATE. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED DETAILED VISUAL AND OLFACTORY INSPECTION OF COCKPIT AND CABIN. RAN PACKS REFERENCING AMM CH 21. NO DEFECTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.