As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A SMELL IN THE CABIN A/C AIR RETURNED TO ORF AFTER T/O SAFELY. CONTRACT MX CW SMOKE IN THE CABIN FIM, FOUND THAT PACK 1 FROZE UP, MOVED TO DMIL OPERATE PER MEL 21-51-00-3 CAT C, EXPIRATION DATE 11/11/1. MX REMOVED AND REPLACED NR 1 PACK AND AIR CYCLE MACHINE. A/C WAS APPROVED FOR RETURN TO SERVICE.