TKOF ABORTED TWICE IN AN AT72. MASTER CAUTION ACFT CONFIGN WARNING. PIC HAD THOUGHT IT WAS A CABIN ATTENDANT CALL ON FIRST EVENT. HAD HEARD AUDITORY SIGNAL.

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THE FOLLOWING IS INFO REGARDING FLT XX; AN ABORTED TKOF. AFTER BEING CLRED FOR TKOF ON RWY 6 AT BDL; AS I ADVANCED THE PWR I HEARD AN AURAL SOUND. I ASSUMED IT WAS THE FLT ATTENDANT; AFTER WHICH WE ALSO GOT THE CONFIGN WARNING. I ABORTED TKOF AT WHICH TIME TWR ASKED WHAT WAS THE PROB. I THOUGHT THE FLT ATTENDANT CALLED DURING A CRITICAL PHASE OF FLT. (I ASSUMED THAT A PAX GOT UP OUT OF HIS OR HER SEAT.) AS WE RETURNED TO THE TXWY AND STOPPED THE ACFT; I CALLED THE FLT ATTENDANT TO SEE IF SHE HAD CALLED; SHE DID NOT CALL. AFTER WHICH WE TESTED THE CONFIGN WARNING SYS AND IT CHKED OK; WITH NO LIGHT ILLUMINATING AND NO WARNING. WE TAXIED BACK FOR TKOF AND DID ALL THE CHKLISTS. AGAIN; WE WERE CLRED FOR TKOF ON RWY 6; AND I ADVANCED THE PWR AND GOT THE CONFIGN WARNING. I ABORTED THE TKOF AND TAXIED BACK TO THE GATE. DURING TAXIING BACK TO THE GATE; I NOTICED THE PARKING BRAKE LIGHT COMING ON AND OFF; WITH IT STAYING ON AFTER ABOUT 15 SECONDS. AT THE GATE I WROTE THE DISCREPANCY IN THE LOGBOOK. MAINT DISCOVERED A FAULTY SWITCH IN THE PARKING BRAKE HANDLE.