Crown 970 help needed

Hello sir can someone help me with mu crown 970?

All the belts are melted theres no trace of what kind size of belt has it
The knobs is stuck
Maybe some springs are already misplaced pls help me sir

I need that manual pls help me

All are working radio aux, only the tape deck has prob

I think the speakers needs to rewind coz the voice rattle when i pump up the bass

And alll the knobs needs to be clean up

Thank you so much

I have also a trk 8080 which is already dead for parts only i can donate it thank you