My transport has "tuning dots" what are these?

Likely they are Marigo dots.

Colors include black, green and white. There are several diameters depending on what the "tuner guy" intended.

I have used them and they are definitely audible.

What do they do though? where are they placed and what is the benefit? I dont want to open it up because with my health its too difficult so I am curious to know about them

They may also be tuning dots made by Combak. I have used them in several components back in the days of "try anything". They were reported to tune the component ridding the system of unwanted anomolies. The science behind it was never clarified.