As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED HEARING A POPPING NOISE DURING CRUISE AND IMMEDIATELY SMELLING SMOKE AND NOTICED SMOKE COMING FROM THE CAPTAIN`S SIDE VENT. DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE ACFT AND R & R THE NR 1 ACM, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.