Sounds more like the condensor is playing up. Have you tried rocking the fridge from side to side, this sometimes works. If not then you will probably see the temperatures start to rise in the fridge as the condensor is packing up. Might be a good idea to put a thermometer in the fridge to see whats happening temperature wise
You'll probably find that a new fridge is cheaper than a replacement condensor.
As you said moving it from side to side made it quiet for a while the last thing you could try would be to empty the fridge. Unplug it and let it stand. Then, turn it up side down and leave it for a few hours.
Then turn it the right way up and plug it in.
Fridges are strange things and this sometimes works, but don't ask me why :D
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