One thing I have noticed flying on several different airline jumpseats is that almost universally the accumulator showed a high leakdown rate on the 757/767 on smaller airlines. They are supposed to be checked routinely by maintenance for the leakdown rate but in practice it does not seem to happen. If the accumulator is going to lose 50% of its charge in a hour it’s not going to stop you when needed. If a accumulator has a high leakdown rate write it up! The aircraft is not airworthy.