B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance
Flight Crew Rejected Takeoff
Human Factors
The aircraft came from maintenance prior to our flight. The captain and I specifically said that we needed to be vigilant and really check for switches out of place or for popped circuit breakers. The takeoff warning horn did not work and; upon inspection; maintenance found the circuit breaker popped. I did not see it in my preflight; even though both the captain and I inspected them thoroughly. This particular circuit breaker is located behind the First Officers (FO) seat; right next to the fire extinguisher.We pushed back; started engines and taxied to hold short of [the runway] awaiting a wheels-up. We were cleared to taxi into position and hold. It was the FO's leg. Upon takeoff clearance; I advanced the throttles and we heard the cockpit door slam open. The flight attendant attempted to shut it but the kick panel fell out in the process. The captain chose to reject the takeoff at 65 knots. We taxied clear; ran the rejected takeoff QRH checklist; verified the brake cooling time and returned to the gate.Maintenance could not initially find the problem with the door. But after spending some time working the issue they found the circuit breaker pulled. It is located behind the captain's chair and is hidden behind a flange designed to prevent the captain's headrest from inadvertently popping a circuit breaker. They reset the breaker and signed off the aircraft. We were able to finish the flight after the delay with no further issues.
[Report narrative contained no additional information.]
B737 flight crew reported a rejected takeoff due to the cockpit door coming open and the flight attendant unable to close it.