As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 831 JFK-STI, AIR RETURN TO JFK DUE TO AIR PACK 2 OVERHEAT RECEIVED DURING CLIMBOUT. APPLIED ECAM/QRH PROCEDURES PACK CONTINUES TO OVERHEAT WITH PB ON OVERHEATED 3 TIMES BEFORE RTB FLOW REMAINDER OF FLIGHT WITH PB OFF. ALSO JEOPARDIZING APPLIED MEL IN EXISTENCE REQUIRING BOTH PACKS OPERATIVE. REMOVED AND REPLACED COMPRESSOR TEMP SENSOR PER 21-61-11-04. OPS CHECK OK.