The Gagia Cubika is a reasonable little coffee machine.

Mine developed a leak, which manifested itself with drips from the area around the heater, going into the drip tray

I also had a probem with the water flow rate being very low

UNPLUG THE UNIT. I know its obvious, but you are working in an area which can give you a shock.

You have unplugged it, haven't you...?

Drain the unit as best as you can. This will be a rather wet repair!