[EC900]

Just looking at the fuse terminals in your photo, they look a bit corroded (unless photo isn’t focusing) but they’re even a different color, maybe even the fuse ends too. Resistance increased due to corrosion can cause an overheating situation.
Brass brush or very fine sandpapering the terminals and fuses ends or better yet replace defective fuse(s).

You may have some work ahead of you to get fresh wire ends reconnected.

Maybe somewhere there’s a aftermarket device tied into that circuit (?) increasing the amp draw without blowing fuse, multimeter can check the amperage on that circuit.
Radio or component (aftermarket?) may be wired wrong if Yellow wire (constant power) is heating up.
Many wire a radio to yellow for radio lighting rather than using a switched circuit.