question about Yamaha B2 modification

I'm interested in the wiring mod he did. I have one of these amps and of course am always looking for legitimate tweeks.
 
also wonder if "air conditioner" means he added ventilation to the top of case?
Or all the frick'n holes that have been drilled into the rear panel. May make a good parts unit if the FET's are good.
 
s-l1600.jpg
 
Seller from Russia is somebody struggling with translator that can't write an ad. Seems like amp was used as a guitar amp or music output and restored aside from back panel somebody stuck in input and outputs.

(guts instide actually look good)
Price usd plus shipping? is laughable.
 
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