I have a 1990 Hoda Accord DX. The other day, it suddenly didn't want to go into gear. Now the clutch pedal doesn't pop back up, and doesn't always engage. But when it does engage, it holds just fine. I've taken it into a few shops, and a couple have told me its the clutch, but one told me its the master and slave cylinders. The clutch isn't even 3 years old, so everything about it says its the cylinders, but I haven't lost any fluid. Is there any way my hydraulic system could be losing pressure without losing fluid?