430 Handbrake is Stuck On

I have an 2006 F430 Spider and today after parking on a rather steep driveway I fully engaging (6 clicks) my handbrake and it stuck on rendering the vehicle unmovable. The hand lever still clicked but had no tension on it in either direction. I removed the rear wheels and manually moved the small arms where the cables attache to each of the rear wheel handbrake calipers. This returned tension to the handbrake lever and unlocked the wheels. But every time I pull the handbrake lever the wheels lock again and I need to manually free them. You can see in the pictures the return springs don't seem to be in a normal position (and are loose) nor are they pulling the pads back from the rotor when the handbrake lever is released. I also tried adjusting (loosening) the tension on the cable using the barrel adjustment nut also shown in the attached pictures.

Does anyone have any ideas as to why the springs are not retracting the pads, returning the caliper arms and allowing the wheels to spin. I'm out of ideas so I'd appreciate any suggestions or experience.
Thank you for the help,
Frank
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Yes the cables move when I pull the hand brake lever in the vehicle and at the calipers in back but only when I physically push down on the arm of the caliper. The cable does NOT move when I release the handbrake lever in the vehicle. The recoil springs on each caliper don't automatically pull the cable back to the default position.
Yes I replaced the factory manifolds with ceramic coated Fabspeed headers and Fabspeed exhaust. I doesn't seem to me that the cable housing would have melted as the cable still freely moves in one direction unless it's just partially melted??? Where would I look to see if the cable has melted, it wasn't obviously near the headers.
Thank you for your help,
Frank

 

Yep the cable is binding somewhat so the hand lever provides enough force to pull the cable but the caliper springs are not strong enough to pull it back. Replacing the cable and I'm looking into wrapping the headers. Any suggestions on type or method of wrap?

 

Thank you for everyone's responses. The cables were definitely seized up in the areas that were in the engine bay. I replaced the cables myself and covered them with the heat shielding sleeves and I also wrapped my headers with the DEI titanium wrap. I took the belt and suspenders approach because I don't want to have to replace them again. Wrapping the headers while still on the car wasn't too bad of a job but very time consuming and itchy. Parking brake works awesome now and hopefully I won't have a problem again.
Thanks again for the advice.
Frank