What was found
CLE FLIGHT 2578 - THE CREW REPORTED A BAGG SMOKE WARNING ACCOMPANIED BY APU BLEED LEAK AND ACTUAL SMOKE IN THE COCKPIT AND CABIN WHILE PARKED AT THE GATE. CONFIGURED AS FOLLOWED APU BLEED OPEN, CROSSBLEED OPEN, PACK 1 CLOSED, PACK 2 OPEN. THE BAGG FIRE BOTTLES WERE DISCHARGED. MAINTENANCE INSPECTED AND FOUND APU BLEED DUCT BLOWN BETWEEN FRAMES 76 AND 80. THE DUCT WAS REPLACED ALONG WITH ASSOCIATED SEALS AND BAGG FIRE BOTTLES. OPERATIONAL CHECKS WERE GOOD.