89 200 Turbo problems

["Fred Brown" <EBROWN-SD@postoffice.worldnet.att.net>]

I was hoping someone may have any suggestions. My '89 200T has recently
started losing power, the turbo seems to boost normally to about 1.2 bar
after that you can hear significant blowoff by the wastegate. The engine
also seems to surge, or bog down at  this point. With 115k mi. on this car
is it fair to say that the turbo is dying, or could it simply be the
wastegate. If so does anyone know the estimated repair costs for this type
of problem??? Any info will be greatly appreciated. Thanks!