What was found
DURING CLIMB THE AIRCRAFT FAILED TO PRESSURIZE. PACK 2 CLSD AND BLEED 2 CLSD AFTER TAKE-OFF -- CYCLED, THEM PACK2 & BLEED 2 WERE OPEN -- THEN ABOUT 5 SECONDS LATER PACK 1-2 CLOSED POSTED -- RAN QRH CHECKLIST: GOT PACK 1 BACK EVENTUALLY, BUT NOT PACK 2-C/A-FOUND HOSE DISCONECTED AT #2 PACK AT AT DUAL TEMP CONTROLL VALVE(LARGE HOSE FWD POSITION). REMOVED AND REPLACED HOSE . GROUND RAN OPS CHECK OF BOTH PACKS GOOD IAW ETN -EM-21-056 AND AMM P.T. 21--60-01