Sorry, I can't type Thai in here.
There's 7805 for CS4361 and 7812, 7912 for opamp output.
Changing OPAMP is quite hard, it's surround by smt R and C. And OPAMP is SO-8 I think.
Don't have tools for such small things.
Changing IC Regulate is easy part, but is that really make a big difference specially on bass area. And what a replacement?