JLG 40H - boom swing does not move in creep mode

I recently bought a JLG 40H and have worked through a number of issues electrical, hydraulic and mechanical and now have everything working with the exception of the swing / rotate function when in creep mode.

Oddly enough, this function did work when I first got the lift, but now after fixing the basket rotate and boom extend / retract function . . . and after a couple of days of use, the creep speed rotate doesn't move at all. When not in creep speed everything works as it should.

Where...

JLG 40H - boom swing does not move in creep mode

JLG 40H - boom swing does not move in creep mode