They don't usually go bad from aging (2 years) or just sitting around. They may need a good, carful cleaning if they have a lot of dust on/in them, but other than that they should be good to go if they weren't abused in any way. Sennheiser is very good about providing replacement parts. A few years ago I got replacement parts for an old set of Sennheiser cans that had been out of production for 8-10 years.
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