Dmason...One mod that I heard described pretty much amounted to bypassing the input signal processing (Level controls, high pass filters, clipping management, amplification configuration, etc) replacing the fan with one that is more quiet, and changing the input and output connectors to a different type.
My thoughts about this are that the fan is a good idea, and the rest of it can wait until I get things sorted out. The input and output terminals are just fine IMHO. I use bare wire clamped into the terminals for output, and converting to RCA plug input is a matter of two gold plated adapter plugs for a grand total of $3.60. At the input there is a 0.47 mfd capacitor in the signal path that might be upgradeable, and running a straight wire around the input circuitry is like chicken soup. However the various features of the circuit are individually bypassable with switches, so we really are talking about the difference between circuit board runs and switch contacts and unbroken copper wire (and that discussion could become long and heated). I don't think that anyone knows enough about the digital power amplification circuitry to justify messing with it. In summary, I think that this amp does not particularly lend itself to useful mods, and I would need to have a detailed description of the mod before I would go for it. The fan change, capacitor, and bypass wire are simple enough to do oneself.
If there is someone out there who can shed more light on the mod details, please chime in.