Sram X-7 Shifters

Has anyone carried out any maintenance on their X-7 shifters Eg opened them up to lubricate internally?
Mine seem to be playing up, in that their getting stiff and occasionally don't appear to change down.
On looking at the Sram website it states that their pretty much maintenance free - is that the case?
Or should I be looking at the cables instead?
Mine seem to be playing up, in that their getting stiff and occasionally don't appear to change down.
On looking at the Sram website it states that their pretty much maintenance free - is that the case?
Or should I be looking at the cables instead?
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have fun.
Parktools :?:SheldonBrown