How to remove 323 instrument panel

[nealward]

I own a year 2000 Mazda 323 and the heater control switch has broken such that only the highest blowing speed now operates. I'd like to remove the central panel that contains the radio, clock, heater controls etc. I have been able to prise out the entire panel but do not know how to detach the air vent control cable from the back of the switch that direct air between windscreen and side vents etc.

Can anyone please help in how to remove and dismantle this central control panel?