where this ground go ? please teach me, what shown is was working for years as design

[kkstereo]

where this ground go ? please teach me, what shown is was working for years as designed.
found this looking for a recent inconsistency channels ON problem ,

 

[kkstereo]

ohh ohh my picture , where it go ? ...

 

[kkstereo]

come on picture, please....

 

[kkstereo]

yeap , diagram and designer builder no more available. Only preamp not working right, one channel now has no power now.