As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#8506, JFK-SYR. (AIRCRAFT PERFORMED AN AIR TURN BACK TO JFK)' 21 L PACK FAIL - LEFT PACK DISCHARGE DISCONNECT; PERFORMED GVI OF L PACK DISCHARGE DUCT IAW AMP 21-00-00 AND FOUND TO BE DISCONNECTED. CONTINUED TO SECURE DUCT OF L PACK DISCHARGE CORRECTLY IAW AMP 21-51-20. IDLE ENG RUN PERFORMED AND FAULT DID NOT COME BACK. NO LEAKS NOTED ON L PACK DISCHARGE DUCT DURING ENGINE RUN. REF AMP 71-00-00 FOR ENG RUN.'