What was found
AFTER TAKE OFF, CLIMBING THRU 11,000, PACK 1 VALVE CLOSED. RESET IAW AOM 1, WOULD NOT RESET. CONTINUED CLIMBING TO REVIEW PROCEEDURE, THEN RECEIVED A BLEED 1 LEAK, CLOSED CROSS BLEED, DECLARED EMERGENCY, RETURNED TO DEPARTURE. PERFORMED AN OPS CHECK OF THE NR 1 PACK IAW MM 21-51-00, OPS CHECKED GOOD. FOUND BLOWN SLEEVE ON NR 2 PACK DUCTING. REMOVED & REPLACED THE SLEEVE IAW MM 21-51-14 OPS & LEAK CHECKED GOOD.