[Amps] Misc. PA-77 questions

[Ka9p at aol.com]

HI.
 
I recently acquired a nice old PA-77, which seems to be working well, but  
have a few questions, if anyone could help out I'd appreciate it.
 
1)  The amp appears to have been modified for 160, and while I can  find 
info about the mod, I haven't found anything suggesting what the tune and  
load settings at any particular frequency should be for a factory mod when  
properly working.  Any ideas?
 
2)  The side panels need to be repainted - is it possible to remove  them 
by removing all the screws, or will this cause lots of internal supports to  
come unhappily undone as well?
 
3) I planned to replace the plate choke with an RFC-3 so the amp will be ok 
 on 12 meters, what's the easiest way to remove the plate choke - i.e. can 
I  unsolder it, and hope to twist it out without removing the subchassis it 
sits  on, or will the subchassis need to come out?
 
4) Anything else quirky about a PA-77 that would save me some grief  
learning from others' experiences rather than my own unfortunate  discoveries?
 
I realize I'm asking these questions maybe 40 years late, but its taken  
that long for me to obtain the amp. :)
 
Any help much appreciated.
 
Thanks, very much.   Scott ka9p