AN ACR WDB FLC GETS AN ENG FIRE WARNING WHEN THE 15TH STAGE BLEED DUCT BREAKS AND LATER THE 'REVERSER UNLOCKED' LIGHT ILLUMINATED. THE FLC SHUT DOWN THE ENG; DUMPED FUEL AND RETURNED TO THEIR DEP ARPT.

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THE FIRE WARNING FOR THE #1 ENG ACTIVATED APPROX 5 KTS BEFORE V1 ON TKOF FROM RWY 11R AT MSP. THE FO WAS FLYING AND THE THRUST WAS NORMAL SO I SAID 'KEEP GOING.' AN EMER WAS DECLARED AND OUR INTENTIONS TO DUMP FUEL AND RETURN TO MSP AND LAND WERE STATED. AT APPROX 800 FT THE #1 ENG 'REVERSER UNLOCKED' LIGHT ILLUMINATED. CONSIDERING OUR SIT; WE DECIDED TO START THE FUEL DUMP AT APPROX 1000 FT AT ABOUT THE SAME TIME WE RETRACTED THE FLAPS INSTEAD OF WAITING AND GOING TO 6000 FT TO MINIMIZE THE IMPACT OF DUMPING FUEL. THE 'ENG FIRE' CHKLIST WAS RUN AND THE FIRE WARNING LIGHT EXTINGUISHED MOMENTS AFTER THE FIRE EXTINGUISHING AGENT BOTTLE WAS FIRED AND THE ENG WAS SHUT DOWN. THE SO THEN READ THROUGH THE 'REVERSER UNLOCKED LIGHT ILLUMINATED' CHKLIST. I INFORMED THE FLT ATTENDANTS; PAX; DISPATCH; AND EMER/RESCUE PERSONNEL OF OUR PROB. WE WERE RADAR VECTORED AROUND THE PATTERN AT 3000 FT AND CLRED FOR THE ILS RWY 11R APCH. I HAD THE FO CONTINUE THE FLYING THROUGHOUT THE APCH AND LNDG WHICH WAS UNEVENTFUL. AFTER CLRING THE RWY; THE EMER/RESCUE PERSONNEL STATED THAT NO SMOKE OR FIRE WAS VISIBLE FROM THE #1 ENG OR THE BRAKES SO WE TAXIED TO THE GATE WHERE EVERYONE WAS DEPLANED. WE WERE INFORMED BY THE MECHS AFTER THEIR INSPECTION OF THE #1 ENG; THAT THE 15TH STAGE BLEED AIR DUCT HAD BROKEN. THE FO AND SO BOTH DID REMARKABLE JOBS AND EVERYTHING WENT VERY SMOOTH. ZMP ALSO DID A GREAT JOB HANDLING OUR FLT.