Sorry the model is GS2727EEDW/11 not g5.
i cant understand how the problem could just occur literally overnight!
We now have a cat so dont have the mouse problem anymore :-)
If it proves to be the compressor, we are just wondering as the unit is 9 years old - would it be worth repairing as this could be the start of big repair bills? A compresser for it is about £400!