keeping amps cool?

Ptss,
I would agree with Csontos, and suggest to seriously consider mods such as replacing and upgrading with better quality capacitors, internal wires , resistors, diodes and rectifiers , binding posts ,etc. Actually they do not cost so much ( compared to buying a new amp) but improvement in performance will be outstanding. I did it on my Cary Audio (AES SuperAmp AE-25 ) and thoroughly satisfied , even people at Cary were surprised at the good result.
Reg cooling : I had on the same amp custom installed a 3" cooling fan at the bottom to take air from underneath and throw into the body of amp. I had even a 2 speed regulator installed which make fan to run at higher speed ( more noise /dB ) while amp on stand bye , but run at half speed while amp in operate mode ( very low noise/dB ) . It works great !

I would leave upgrade work to Spectral.
Who would you suggest?

Any tech with more knowledge than just trouble shooting. Someone who specializes in this kind of work with lots and only good feedback. You have to do your home work, seriously.

My homework says Spectral will do just fine. Did you have anyone in mind?

I had four Acoustat TNT amps rebuilt and modded by Roy Esposito in Florida recently. He was a principal engineer in that company and instrumental in the amp's design. He now runs a shop dedicated to preserving the Acoustat line. He added balanced inputs and mono capability along with the full rebuild/upgrade. The amps are very impressive. I've had them for about a year now and they just seem to get better and better. They never cease to surprise me. I cannot find fault with them. They have everything in spades. However, he is not cheap. Cost of each amp was about 500 and the work about 900 each. To use his words, "This amp will run circles around amps costing ten to fifteen thousand". He wasn't lying. Imo, he was being conservative. I believe he's willing to take on other brands as well.

In Toronto there's a guy who used to work at Brack's, a high end audio shop, who now runs his own show. Very highly sought after. His name eludes me but I could round it up.