This is not a problem (yet), but I've noticed a squeak when I activate the electronic door lock/unlock. The locks still function normally.

Questions:

1) Is there a part that needs to be greased?

2) If so, what part and where is it?

3) How much disassembly is involved and would it be worth it for preventative maintenance? See this for reference and a little bit here.

Thanks.

 

You probably have the same issue as my car. The little motor is getting old and starting to fail. So it will whine and squeak as it struggles to function.
On the bright side it will do this for many years before it fails, but here is a video if you want to change it. I bought that little motor like 4 years ago and my noisy door is still going strong without changing it.

 

Thank you, Si.

I will take a look at this video.