HELP! replaced front control arms but still have creaaking steering!

[ecswtrav]

I have a problem with my 2000 Boxster in that the steering column creeks when i steer. It happens when I drive and when im parked up and try to steer. Unfortunatley this problem does not happen all of the time - its as if somehing happens whilst driving that brings the probem on.
To cut a long story short I took the car to the garage who suggested the problem was the front control arms. They didnt get to experience the problem as it didnt happen when I got there. They replaced the front control arms costing me a fortune and in fairness I have no squeeking now as I go over bumps - so they worked in that respect.
However, just yesterday the creaking problem was back worse than ever - can anyone suggest what this creaking may be? The sound rather reminds me of stretching a thick piece of rubber under tension if you see what i mean.

I would be grateful for any help.

Thanks