I doubt Steve would be able to address TRL mods, as they are proprietary and undisclosed. I do know that TRL has modified a lot of gear, including amps. I'm not sure they have done a DNA, but I know another Audiogon member (lkdog) who had his Musical Fidelity integrated amp modified by TRL with excellent results.
As an aside, unless you're married to the DNA, why not try the TRL D-225 amp out. I have one and it is an excellent component.
As an aside, unless you're married to the DNA, why not try the TRL D-225 amp out. I have one and it is an excellent component.