Hi. I'm Dave.
Apparently, Tim is not online at the moment, and your question got "redirected" to the "open questions" list. So I will try to help you with the question you are asking.
First, The fluid only goes from the pump motor to the hydraulic cylinders. You can trust me when I tell you that if there is an external leak in this system, you will KNOW. There will be hydraulic fluid all over the back of the car.
The vehicle manufacturer does not provide any information for "checking" the fluid. The reason for this is because the motor, pump, lines, and hydraulic cylinders are only serviced as a complete unit. If you have to buy a new unit, it comes complete and already filled with fluid. Any external (or internal) leaks in this system that render it inoperable, require the replacement of the entire assembly.
Please download the PDF file HERE
Please note that this file will be deleted from the file server in a few days due to copyright restrictions.
Also note that this is NOT a mistake. I am fully aware that the file actually says "2006 PT CRUISER", not "2005". However the manufacturer's service information for these two years is EXACTLTY the same, with no changes between these two years.
You may want to read through these instructions, so you can get an idea of how this system must be diagnosed and/or repaired.
Let me know if I can assist you further.