What was found
FLT 919, JFK-ORD, CLIMBING THRU FL320 CABIN ALTITUDE HIGH EICAS MSG. BOTH PACK WORKING PSI NORMAL. OUTFLOW VALVE FULLY CLOSED. AIR RETURN TO JFK. FOUND NR 2 PACK DUCT TO BE CRACKED. REMOVED AND REPLACED PACK DUCT RT SIDE NR 2 PACK, REF 36-10-00. OPS CHECK OK PER MM 21-31-00. NO FAULTS NOTED AT THIS TIME.