As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 515 - ATL - WHEN THE AIRCRAFT WAS PASSING THROUGH 17,000 FEET WHEN IT LOST CABIN PRESSURE AND WAS UNABLE TO CONTROL MANUALLY. AIR RETURN. FOUND LEFT AND RIGHT PACK DUCTS BLOWN OFF AT WATER SEPARATORS, REINSTALLED LEFT AND RIGHT DUCTS AND REPLACED LEFT COALESTER BAG. PRESSURIZED AIRCRAFT OPS CHECKED GOOD. (M)