3.0d, Rear brake disc heating up (right only)

[alexxxa]

Hi there guys.
So, I've been having this problem for a while, and I wanted to ask for advice before I start changing everything, part by part.

As the title says, my rear right brake disc is heating up more than the rest of them. It gets to be even 50-100 degrees Celsius warmer on certain spots (if I measured well, it is after the caliper) than the left one.

If I drive longer routes (let's say, 30+ min drive), it gets hot, so you can hear squeaking and scraping noise coming from the rear right, and the right wheel gets warmer than the left (of course, you can't touch the brake disc itself).

Important to mention: I changed handbrake pads (ATE), brake discs (ATE Power), brake pads (ATE), and brake fluid (ATE Typ 200 DOT 4) six months ago.

I'm suspecting (and hoping) it is just the right rear caliper.
However, when you lift the car, put it in neutral, and spin the rear wheels by hand you don't feel much of a difference. We cleaned the caliper again, but no difference.
Also, I eased up the handbrake pads on the right side (right cable also), so it seems it's not them (plus, the hottest spots I measured are after the caliper. Before the caliper the temperature seems to be normal).

What do you guys think?

1. Would you also first go with changing the caliper?
2. Or maybe the pads, that is the one on the right is faulty?
3. What is the chance that the brake disc came faulty, and is slightly bent?
4. Could it be the wheel bearing? But I don't have any other symptoms.
5. Something else?

I appreciate your suggestions before I start blindly changing part by part.