Ayre V-3 Audio Improvements

Purchased my V-3 over 20 years ago.  It has lost it's "sonic punch".  I have schematics for the unit.

Does anyone have instructions for adjusting the variable resistors (VR1 thru VR6) to improve the "sonic punch".

Also, I have heard replacing some of the caps will also help.  Cap part numbers range from C1 thru C18.  Which caps have the greatest impact?

Thanks for any advice/information.