Don't they have a lifetime warranty ?

Call Cycleops, they will almost certainly replace it for free. I'm on replacement unit #3 and the first one was bought second hand (and I told them so).

If you are the original owner. I've had one leak on a unit I bought secondhand off of Craigslist. They wouldn't warranty it for me but offered a warranty replacement price for the resistance unit. $100+ shipping for me a few years ago.

Now my current resistance unit should be under warranty at least.

It will get worse, call them, they'll replace the unit. I had to send in the bad units 1st, shipping is on you. Turn around time should be less than 2 wks.

Thanks!