Doepfer

I've had this module about 2 months, and it's been working fine until today. When I press a key on my midi keyboard controller, the LED lights up, and the CV pitch changes....but there is a consistent ~5V at the gate jack. It doesn't drop to zero when I release the key....it stays consistent at around 5V. All other jacks are working normally when the appropriate midi controller function is activated.

Anything I can do for a DIY repair? Thanks for your help