First, where is there a .01 cap in the tonestack of an AB763? Did you mean the .1 cap? If you did, and the bass cap was changed from .1 to .047 I wouldn't even sweat it. I'd be surprised if you hear a difference between them.
2) The .02 cap feeding the PI always seems like a good idea to modders. It's usually not. AB763 amps have AMPLE LF in the preamp without letting it all get to the PI. SF amps used a .01 here, but with other changes to the PI. I usually opt for something like .0022 in my own starter designs and I found a .001 sounded best (to me) in an AB763 build I did a few years ago. YMMV, but I'd change it a .001 and call it done.
And C) Those IC caps are probably bad or going to be soon enough that a cap job should be a consideration.