Pictures of seperating amp and sub?

Hi, recently my S750 have a problem.
Power is on, but the sound seems to be muffered. Tried all speakers, all are ok. But when i plugged into the Sub, the sounds when muffered again.

I read some of the post here, i am guessing if my sub suffered from high heat and vibration. Thus, damaged the components inside.

Will it be possible to send me some pic, or DIY advices for me to fix my s750?? I really love this system. i really wanna fixed it.