As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING DESCENT, THE AIRCRAFT DEPRESSURISED. UPON INSPECTION, THE FORWARD CLAMP ON THE FRESH AIR TUBE WAS FOUND LOOSE AND THE TUBE WAS DISCONNECTED. THE FIBERGLASS ON THE EVAPORATOR BOX WAS THEN REINFORCED AND THE CLAMP REINSTALLED.