After research I took the top off my Classixx 7, then the side, which meant I had to remove some of the front, too. This goes better if you have an assistant to hand the screws you take out to, and get them to draw a screw map for replacement.
Use a digicam and photograph it as you undo things. You may need the pics later!
You do need a Torx screwdriver of the right size, and to unplug from the mains. Put newspaper down, there will be spillage. And the edges of the sheet metal are sharp. Use care.
The side panel needs to be levered gentle away from the front panel, which may mean your heart is in your mouth. To avoid damage to the paint, use cocktail sticks to start prying it apart and then soft wedges. Multiple ice lolly sticks work well.
There are more screws than you expect, including some up from underneath. There are rumours of a secret panel. Not on mine.
Eventually, bottom left front there is a grey page with a motor in. Mine was held by a single screw, it looked badly assembled! Undo that and unclip the cage, and unclip the motor/pump assembly and remove. Use care with the wires!
Unclip the pump chamber from the assembly, remove crud, check rotor spins and replace pump chamber.
On the assembly there is a two pronged fork with electrical contacts on. Clean them. They dip into the sump, so must be a float switch with no float (0.9 probability)
Now look at the black pipe that goes form the pump assembly to the back of the machine. It's short. With CARE, prise it off the spigot and clean inside.
Then the black pipe that runs bottom to top that fills the dratted condenser drawer. Remove each end and clean it out too.
I modified my machine. I led the top of the pip to my washing machine drain. Who needs to empty the drawer ever again?
Reassemble with care. If you have to force anything then you have it slightly wrong. Refer to those pics. Oh, my machine was badly assembled in the factory, to my drawer was always hard to close. My digicam pics were no help there, I had to modify the reassembly a smidgen It's not hard.
After reassembly and before restarting, clean out the condenser element and wipe the sensor sticking out in the tunnel to the right, just out of sight.
I can see why they charge a lot for the engineer. It;s a lengthy process and a bit awkward to get things to fit back together, but logic and tea helps!
Tim, February 2016