As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED DURING CRUISE THAT THEY HEARD A LOUD POPPING NOISE FROM REAR OF ACFT. A RAPID DECOMPRESSION WAS FOLLOWED BY THE NOISE AND THE CREW DECLARED AN EMERGENCY PERFORMED AN EMERGENCY DECENT. DURING THE DECENT THE CABIN ALTITUDE. CONTINUED TO CLIMB TO A POINT WHERE THE O2 MASKS WERE DEPLOYED. THE ACFT LANDED SAFELY. MX INSPECTED THE ACFT AND FOUND THAT DUCT ON THE COALESCER SOCK WAS NOT SECURED.