Shifter Stuck in Neutral

2015 Mojo Auto Surf

Yesterday I used the interlock release so I could increase RPM’s. Only would increase moving the handle forward using the interlock release button.
Today, lift collar and won’t move forward or back. Interlock release still works but again, handle only goes forward for that.
At transmission you can see the cable tip jiggle when trying to shift. Feels like the collar isn’t fully releasing to allow the shift. But it does for revving engine.
Anyway, any ideas? Anyone know how to disassemble the shifter? Diagrams? Any help is welcomed.

Trying to understand.

Yesterday, interlock pushed, engine revved fine.
Back to neutral, the interlock button should click back out fully.
Then lift collar and boat moves. This part isn't happening?

Collar will not lift fully if the interlock button is stuck.
Shift cable could be stuck/jammed.

Sorry I don't have a diagram.

Thanks. Interlock push button looks like it’s all the way out. I’ll try that again. Collar lifts but maybe not complete.

Update- detent ball at transmission shifter locked up. Shop pulled it, greased it up and back on the lake we go!