If you have the T4 or Notebook diagnostic scan tool then check for suspension malfunction codes.
But to be honest on the 2003 its now 13 years old, and only after 8 years this system is known to give a lot of expensive problem .
What i suggest you do as i do, is talk to your customer and tell him/her it would be cheaper and better in the years to come to change the suspension system to the conventional type of spring and shocks .
here is an example Please click here
Please click here for more information
Still need additional information then please get back to me with the reply button, and not the poor or bad service, this way i can get back to you or suggest another expert if needed.
Your deposit does not pay me until the answer is rated in a positive way,
A bad rating does not constitute a refund.
If you are not happy or you have sorted out your problem before the answer then please let me know with the reply button .
Kind regards Greg.