It is not unusual for these cars to lose some accumulator pressure, slowly and over a matter of days/weeks, when the car is turned off. If it's losing pressure quite rapidly you either have accumulators that need rebuilding or accumulator control valves that are in need of rebuilding.
Bleeding the system should have little effect on the issue you're describing.
I just e-mailed another forum participant the non-official, but completely effective and much easier, brake/hydraulic system bleeding instructions for the SY series cars. PM me with an e-mail address if you'd like it.