As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT A/C PACK TRIPPED ON TAKEOFF ROLL. RETURNED FOR LANDING DUE TO SMOKE AND FUMES IN THE CABIN AFTER TAKEOFF. FOUND LEFT AIR CYCLE MACHINE SEIZED. REPLACED LT ACM PER M/M 21-51-03-004. LEFT PACK CKS OK, RAN BOTH ENGS. NO SMOKE OR ODOR NOTED.