Like most things they ARE repairable.Its just a case of "do the manufacturer a)repair them,or b)sell the spares u need to repair them (it may only be an O-ring that needs replacing)
The answer is to get them repaired. After a conversation about these ealier I know the price they once cost. Only problem is there from some japanese company so goodluck trying to contact them/understand them
As already mentioned, best bet is to get them ID'd and see if you can send them off for repair.
Only problem is, if they are a JDM make, you may need to send them back to the land of the rising sun to get done, in which case a new pair maybe needed