my buddy just did a driver side turbo on his z32 tt.
hes a tech and he swore to never touch that job again without pulling the motor. it is doable but i think pulling motor/trans out is the quickest way.
to get to the driver side turbo he pulled the radiator, all piping, brake booster and still very little room.
right now im working on a blower setup in a 1970 opel gt. its one of those cars you wanna burn down because there is no room. the z32 is very close behind
personally i wouldnt touch that job for 250 unless you are about to be evicted from you home and need cash.
i would replace both turbos as mentioned above. its the same shitty oil that goes through both turbos. if one failed then the other one is most likely on its last leg.
when doing the pass turbo inspect the driver side. good luck.