As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3054 - DTW - FLIGHT CREW REPORTED SMELL SEEMED TO BE COMING FROM 4TH SEAT ROW OVERHEAD, IT DID NOT CHANGE WITH PACK ON OR OFF. MX REMOVED AND REPLACED OVERHEAD CEILING BALLAST NR 4 AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.