Doepfer

SO I am trying to fix the doepfer ribbon controller because the USB connector on the controller has become loose and intermittent.

I removed all the screws (including two which appeared to have been glued in place with Loctite and required screw extractor tools).

Now that the screws are undone I need to get under the circuit board so I can replace or resolder the usb connector. 
The problem is that it won't come out of the enclosure. I would have thought that it would just fall out when held upside down but it does not budge. I have tried leveraging the edges with a flat blade screwdriver but all that happens is the PCB flexes at that point.

How do I remove this???