As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK 1 FAIL EICAS MSG DID NOT HAVE ENOUGH FUEL TO CONTINUE ON TO CVG ELECTED TO DO AN AIR RETURN TO DFW DISC-SHORTLY AFTER TAKEOFF, NR 2 BLEED AND PACK VALVE CLOSED ANNUNCIATED ON THE EICAS. PER AOM; CYCLED BLEED VALVE AND PACK SEVERAL TIMES. UNSUCCESSFULLY. NR 2 PACK VALVE WOULD NOT STAY OPEN. REMOVED AND REPLACED BLEED HOSE AT DUAL TEMP CONTROL VALVE PACK OPS CK GOOD IAW EMB 140 AMM 21-20-00. AIRCRAFT RETURNED TO SERVICE.