A MEDIUM LARGE TRANSPORT WAS DISPATCHED IN NON COMPLIANCE WITH THE APU FIRE BOTTLE CIRCUIT BREAKERS NOT UNCOLLARED AND RESET AFTER MAINT.

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SCHEDULED DEP. ON ARR AT THE ACFT; FO AND FLT ATTENDANTS WERE ALREADY ON BOARD. I WAS INFORMED THAT MAINT WAS BEING PERFORMED IN THE TAIL CONE AREA. SINCE THE LOGBOOK WAS NOT AVAILABLE; I WENT BACK TO ASK MAINT PERSONNEL WHAT WAS GOING ON AND WAS TOLD THAT THE APU FIRE BOTTLE SQUIBS WERE BEING REPLACED. WE WENT ABOUT OUR PREFLT/BRIEFING DUTIES. WHEN I RECEIVED THE LOGBOOK; I REVIEWED IT AND VERIFIED (AMONG OTHER THINGS) THAT THE ACFT HAD A CURRENT AIRWORTHINESS SIGNOFF AND THAT THERE WERE NO OPEN WRITE-UPS. I FURTHER VERIFIED THAT THE WRITE-UP REGARDING THE SQUIBS WAS PROPERLY SIGNED OFF. THIS EVENING; I WAS INFORMED BY ANOTHER CAPT THAT MAINT PERSONNEL HAD APPARENTLY NEGLECTED TO UNCOLLAR AND RESET THE FIRE BOTTLE CIRCUIT BREAKERS AND THAT HE; I; AND ONE OTHER CAPT HAD FLOWN THE ACFT IN THIS CONDITION. SUPPLEMENTAL INFO FROM ACN 535320: I COMPLETED MY PREFLT SAVE FOR THE FIRE TEST AS IT DOES NOT WORK WITH THE FIRE HANDLES OUT AND PREPARED NORMALLY TO PUSH BACK FROM THE GATE. APPROX 5 MINS PRIOR TO PUSH; MAINT CAME UP TO THE COCKPIT AND STATED THEY HAD COMPLETED ALL OF THEIR MAINT FUNCTIONS AND TOLD US IT WAS OK TO PUSH THE FIRE HANDLES IN; WHICH I DID. I THEN DID A FIRE TEST AND THE SYS CHKED GOOD. WE WERE UNAWARE THAT MAINT DID NOT RESET THE FIRE BOTTLE CTL CIRCUIT BREAKERS UNTIL WELL AFTER THE FLT. IT WAS NOT DISCOVERED UNTIL THE THIRD CREW AFTER US.