Almost all 412's have a small spring energized accumulator in both Systems 1 and 2. They are part of the Lock-n-Load feature preventing the stick from being back driven by rotor loads when hydraulic pressure is unavailable. The accumulators are only a few cubic inches and at 600 psi are only there to keep fluid in the actuator in case of a leak. As Dexus stated, a few control motions normally empties the accumulators. Note 412s as of 2015 eliminated the accumulators. Turns out they were an unnecessary carry over from the original single boost aircraft.