As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW NOTED SMOKE AND LOUD NOISE FROM FLT DECK AIR CONDITIONER PACK. TRANSFERRED TO DMI NR 00618 PER MEL 21-1. REMOVED AND REPLACED FLT DECK COOLING TURBINE ASSY DUE FAILED IAW MM SMP 581-21-50-00, PG 206. OPS AND LEAK CHECKS GOOD. CLEARED DMI 00618 AT 28663 TAT.