A CANADAIR CL65 IN CLB AT FL260 DECLARED AN EMER AND DIVERTED DUE TO A MAIN CABIN DOOR WARNING.

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THIS FLT WAS TO OPERATE FROM CID TO CVG AS A SCHEDULED PAX FLT. WE HAD 39 PAX; 2 BABES IN ARM AND A CREW OF 3. DURING OUR CLB TO FL290 WE HAD A 'DOORS;' EICAS MESSAGE ILLUMINATE THEN GO OUT. THE FLT ATTENDANT WAS CALLED AND ASKED TO CHK THE WITNESS MARKS ON THE DOOR FOR ALIGNMENT. WE WERE PASSING FL190 WHEN THIS FIRST OCCURRED. THE FLT ATTENDANT ADVISED THE MARKS WERE ALIGNED. OUR MAIN CABIN DOOR ON THE CL65/CARJ IS NOT A PLUG TYPE SO THIS IS A CONCERN FOR THE DOOR TO BE SECURED. WE CONTINUED OUR CLB AND WHILE APCHING FL260; THE MESSAGE CAME ON AGAIN AND REMAINED ON. THE FLT ATTENDANT WAS ADVISED TO TAKE A SEAT IMMEDIATELY AND OF THE SIT. THE QRH WAS FOLLOWED WHICH REQUIRES AN 'EMER DEPRESSURIZATION' OF THE CABIN. AN EMER WAS DECLARED AND AN EMER DSCNT INITIATED. VECTORS TO THE NEAREST SUITABLE ARPT WERE REQUESTED AND ATC VECTORED US TO BMI WHICH WAS APPROX 20 MI TO OUR SE. A VISUAL APCH AND LNDG WAS MADE TO RWY 2 AND THE ACFT WAS MET BY CFR/EMT'S AT THE GATE TO PROVIDE MEDICAL ATTN TO SEVERAL PAX HAVING DIFFICULTIES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A CANADAIR CL65 REGIONAL JET. THE RPTR SAID THE MAIN CABIN DOOR WARNING SENSORS ARE MOUNTED ON THE DOOR AND MONITOR 2 OF 4 DOOR LOCK PINS. THE RPTR STATED MAINT FOUND 4 BROKEN WIRES IN THE WIRE BUNDLE THAT GOES FROM THE DOOR FRAME TO THE DOOR. THE RPTR SAID EACH TIME THE DOOR IS OPERATED THE WIRE BUNDLE IS FLEXED; ULTIMATELY BREAKING THE WIRING. THE RPTR STATED THE QRH SHOULD BE REVISED AND UPDATED FOR THE EMER DEPRESSURIZATION PROCS. SUPPLEMENTAL INFO FROM ACN 403705: AS THE FO ON FLT FROM CEDAR RAPIDS; IA; TO CINCINNATI; OH; I WAS ACTING AS PNF. AT FL260; WE GOT A PAX DOOR WARNING. THE CAPT FLEW AND HANDLED THE RADIOS WHILE I RAN THE PAX DOOR EMER CHKLIST. THE CHKLIST CALLED FOR A DECOMPRESSION OF THE CABIN. THE CAPT ELECTED TO MAKE A PA ADVISING THE PAX AND THE FLT ATTENDANT OF OUR ACTIONS. HE THEN DECLARED AN EMER AND ASKED FOR A LOWER ALT FROM CTR. WE WERE GIVEN 10000 FT AND BEGAN THE DSCNT. WE DEPRESSURIZED THE CABIN AS PER THE CHKLIST AND DONNED OXYGEN MASKS. THE CHKLISTS CALLED FOR AN EMER DSCNT PROC WHICH WE HAD INITIATED. THE PAX OXYGEN MASKS DEPLOYED AUTOMATICALLY WHEN THE CABIN ALT ROSE. WE RECEIVED VECTORS TO THE NEAREST SUITABLE ARPT; BMI. AT 10000 FT MSL THE CABIN ALT WAS DOWN TO 10000 FT. WE REMOVED OUR MASKS AND CALLED THE FLT ATTENDANT. SHE ADVISED US THAT SOME PAX NEEDED MEDICAL ATTN FOR HYPERVENTILATION (APPARENT) AND EAR PROBS. THE CAPT NOTIFIED APCH TO HAVE AN AMBULANCE MEET THE ACFT. AFTER ALL EMER AND ABNORMAL CHKLISTS WERE COMPLETE; WE PERFORMED OUR NORMAL DSCNT/APCH AND BEFORE LNDG CHKLISTS. WE LANDED AT BMI AT XA00 LCL WITHOUT FURTHER INCIDENT. 3 PEOPLE WERE SENT TO THE HOSPITAL WITH EAR PROBS. THE RELIANCE ON DIVISION OF DUTIES AMONG THE CREW WAS ESSENTIAL IN THIS SIT. TIME WAS OF THE ESSENCE SO ACCOMPLISHING EVERYTHING ON THE CHKLISTS WAS QUICK BUT THOROUGH. THE FLT ATTENDANT COMMUNICATED ESSENTIAL ITEMS WELL AND REMAINED CALM.