Question of 32x

I've recently bought a 32x and it have two resistences and a pair of cables solded to it, i've asked to the seller and he don't knows for what are they to.

My question is there is any mod (like 60 HZ switch for genesys) for 32x?

It don't seems to be a repair but it works perfectly.


PS.I'm from spain and my mega drive a pal.