Michael Percy Audio sells Black Gates. If all you have to do is swap out cap's maybe you could do it yourself and not have to ship out the pre.
FWIW, I asked Adcom about swapping out components and they told me they use high quality components throughout and there was no need to upgrade anything.
FWIW, I asked Adcom about swapping out components and they told me they use high quality components throughout and there was no need to upgrade anything.