Latest update. Clutch has been slipping, & starter just went out couple days ago. During past work I've noticed oil in both turbos air outlet lines & also have a slow external oil leak somewhere above PS turbo (likely oil supply or return lines). So I expect we'll be pulling engine & trans to replace clutch & turbos.
I've been giving serious thought to just rebuilding the turbos, rather than the dealing with the cost of new K04s + the extra hardware. A K03 rebuild kit is $50, vs $$$$ for new turbos.