Bag of spanners

We have a Viesman freezer room with a R404A Electrolux compressor that has suddenly developed a sever rattle although it continues to function perfectly.
As an electrical engineer with very little knowledge of refrigeration do we need to get an engineer to replace the compressor or is there something that we need to do like lubrication etc.

Compressor motor inside housing is hanged on few coil springs. When one is damaged you have that ratling sound. If you could bare that noise, leave it as it is. If not you should change compressor becaose nothing could be done.
But before, check once more that compressor is source of noise, not some pipe or simmilar which touches compressor.

if a run capacitor is fitted it may pay to check that also

Thanks guys, people say if it works leave it alone so if it only noise we can put up with that for now