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Hi my name is***** root issue is the right rear brake drum gets hot after driving a short time. All brake parts have been replaced. It sounds like the right rear shoes are dragging on the drum. I believe the shop that made the repairs has over adjusted the rear shoes on the right side. The drum should be able to turn with slight friction but easily by hand with the wheels off of the rear axle. If that is not the case they need to be properly adjusted.
The parking brake cable may be seized as well, but since this all started after work performed to the brakes I do not see it likely. You can pull and release the parking brake a few times and see if that helps with the drag.
I think the first step is to confirm the brake drag by jacking up the rear axle, using jack stands for safety. Removing the rear wheels with the vehicle in neutral and spinning the affected drum. Compare it to the left side which should be operating normally. It should have some drag but still easily rotated. If you are not making your own repairs I suggest you have the second shop adjust the rear shoes and check the parking brake cables. Let me know if you are satisfied with the answer to your question!