As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI FLT 3088 THE CREW REPORTED SMOKE IN THE CABIN DURING PACK 2 OPERATION.MAINTENANCE PERFORMED ENGINE 1 AND 2 RUNS WITH BLEED 1 AND 2 OPEN AND BOTH PACKS OPERATING. NO DEFECTS WERE FOUND AND OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.