So to fix it i'll need soldering kit and spare switches? Where can i get them?
To fix a switch issue on Filco keyboard, I think you need at least these stuffs :
+ A MSR card like Visa or Master to open the keyboard
+ A soldering iron + 2m of solder (0.6mm, 63/37) and a soldering pump. You can get these things at your local electronic store or borrow from your friends.
+ A spare switch would be hard to buy but someone on GH could send to you a switch for free except the shipping costs.
So my advise is to find the root cause with your own risk before buying anything by:
+ make sure that you are using a glove
+ open the keyboard using a screwdriver + a MSR card
+ put the cover away but still keep the usb wire
+ bring it to the computer
+ put it up-side-down on a soft towel
+ plug the keyboard in and open a text editor application
+ use a wire and try to link 2 legs of the Enter key switch position. If you see the Enter key generated correctly as the times that you try to link, the key switch is likely the root cause. If you still see the Enter key randomly generated, the problem would be the PCB / controller, then you may need to investigate the diode or something else