This one is getting out of my wheelhouse.
The wife's '08 WRX has developed a shifting issue. It refuses to engage reverse and will only engage the forward gears when I double clutch and push the pedal all the way down very hard. The clutch pedal seems very light and only seems to engage at the end, but I don't drive it every day. I also noticed that during the last 1/2 of travel there is a vibration that can be felt in the pedal. The car doen't creep forward with the pedal out and car in neutral.
I checked the clutch hydraulics and everything is dry, no air in the system, and slave cylinder travel is approx. 19mm.
Thanks.

