I'm having problems getting to all the solder joints on my 300E push button unit.

The unit has a bottom plate, which comes off fairly easily and exposes most of the solder joints.

What I can't figure out is how to get the front face off to get to the other solder joints, like the fan speed control button area. I see 4 clips, but I think the front 5 push buttons are keeping it on.

Do these buttons pop off? Anyone know a trick to completely disassemle the unit?

Thanks so much for any advice...

Here's what I have apart so far