AN EARLY MORNING TKOF WAS CONTINUED AFTER THE FLC HAD NOTED A DOOR WARNING LIGHT ON THEIR CONSOLE IN THEIR DO328-300 ACFT AT CWA; WI.

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OUR TRIP STARTED MAR/FRI/02 AT XA40. WE WERE SCHEDULED TO FLY ACFT TO CWA ON A STANDUP OVERNIGHT AND RETURN IN THE MORNING TO MKE. FLT WAS SCHEDULED TO DEPART AT XB40; BUT DUE TO A LATE ARRIVING ACFT; WE FINALLY DEPARTED AT XC30 ARRIVING IN CWA AT APPROX XD30. ON SATURDAY; THE FOLLOWING MORNING; WE WERE SCHEDULED TO FLY FROM CWA-MKE. WE ARRIVED AT THE ARPT AT XJ15 LCL FOR AN XK15 DEP. UPON ARRIVING; THE GND CREW NOTIFIED US THAT THE JETBRIDGE HAD BEEN DRIVEN INTO THE MAIN CABIN DOOR DAMAGING THE FORWARD RAILING. AFTER REACHING THE ACFT AND ASSESSING THE DAMAGE; WE CALLED MAINT AND DECIDED TO FERRY THE AIRPLANE BACK TO MKE TO BE REPAIRED. AFTER ARRANGING THE PAPERWORK FOR THE FERRY PERMIT AND THE INFO RELEASE; WE DID OUR ACCEPTANCE CHKS AND PREPARED FOR DEP. DUE TO THE SHORT OVERNIGHT; NONE OF THE CREW HAD OVERNIGHT BAGS; AND WITH NO PAX THERE WERE NO BAGS IN THE CARGO COMPARTMENT. THE ACFT WAS DEICED PRIOR TO OUR ARR TO THE AIRPLANE. THERE WAS 1 GATE AGENT AVAILABLE TO PREPARE US FOR DEP AND MARSHAL US OUT. THE OTHER 2 AGENTS WERE REBOOKING PAX FROM THE CANCELED FLT. WE DID OUR STANDARD CHKLIST ITEMS AND TAXIED OUT TO THE RWY FOR TKOF. SINCE IT WAS AN FAR PART 91 FLT; THE FLT ATTENDANT SAT IN THE COCKPIT JUMP SEAT TO OBSERVE COCKPIT OPS. ALL CHKLISTS WERE COMPLETED AND EVERYTHING APPEARED NORMAL PRIOR TO TKOF. DURING THE TKOF ROLL AT APPROX 80 KTS; THE FO AND MYSELF NOTICED THE 'DOORS' LIGHT ON THE RED WARNING PANEL. WE DECIDED NOT TO ABORT DUE TO THE FACT THAT WE WERE IN THE HIGH SPD PHASE OF THE TKOF; AND BECAUSE OF OUR EXISTING ISSUE WITH THE MAIN CABIN DOOR FOR WHICH WE WERE FERRYING THE AIRPLANE; WE ASSUMED IT WAS RELATED TO THAT DOOR AND WE WERE SURE IT WAS SECURE. ONCE AIRBORNE; WE RECOGNIZED THAT THE BAGGAGE DOOR WAS INDICATING OPEN. WE REMAINED IN THE PATTERN TO RWY 8 AT CWA AND LANDED. ON THE GND; WE SHUT DOWN THE ENGS AND INSPECTED THE DOOR AND REALIZED IT WAS OPEN; AND DAMAGE HAD OCCURRED TO THE TOP CONNECTING ROD OF THE DOOR. THE HANDLE ON THE DOOR WAS IN THE LATCHED POS. I ALSO OBSERVED THAT FROM MY SEAT POS FOR TKOF; THE VIEW OF THE TOP ROW OF THE RED WARNING PANEL WHERE THE 'DOORS' LIGHT IS LOCATED IS OBSTRUCTED BY THE GLARE SHIELD. IT HAS YET TO BE DETERMINED IF THE DOOR WAS ACTUALLY OPEN PRIOR TO TKOF. THE RAMP AGENT MARSHALING THE AIRPLANE OBSERVED THE DOOR TO BE CLOSED PRIOR TO TKOF; AND THE TWR CTLR AT CWA OBSERVED THE DOOR TO BE IN THE CLOSED POS DURING THE TKOF. THE FO; MYSELF AND THE FLT ATTENDANT IN THE JUMP SEAT NEVER OBSERVED THE 'DOORS' LIGHT UNTIL DURING THE TKOF ROLL. FACTORS AFFECTING THIS SIT INCLUDE: THE DISTR OF THE ORIGINAL MAIN CABIN DOOR ISSUE. ABNORMAL GND OPS OF NOT HAVING ANY PAX OR GAGS. INABILITY TO SEE THE DOORS LIGHT FROM WHERE I HAD MY SEAT POSITIONED FOR TKOF. LACK OF CREW REST. SUPPLEMENTAL INFO FROM ACN 541389: FOUND THAT THE CARGO DOOR HAD BROKE THE SUPPORTING ARM ON THE CARGO DOOR. SOME DAMAGE DONE TO THE CARGO DOOR AND SIDE OF THE ACFT.