You can get a Re-Build Kit for it.
THEN immediately go through GSXR's Wastegate Swap.
Wastegate actuator swap for OM602.962?
Be Aware @ 200K you might be looking at a Tranny Reman in the future.
Also GSXR's W124 Buying Pre-Inspection tips:
http://www.w124performance.com/docs/mb/articles/124.1x3_buying_tips.txt