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Low water temperature from thermostatic shower?

My Thermostatic shower isn't as hot as it used to be.
Even with the temperature control knob turned onto max the water isn't coming through as hot as I would like it.
The temperature of the hot water is as hot as it always was coming from other taps.
Are there any parts that can be serviced / replaced inside the shower controls?
Thanks.
tjd, March 2009