He needs to have it rebuilt or replaced.
It's pretty easy to remove the bolts and pop the housings off. It's even easier to break the bolts off in the turbine housing.
In order to access the bearings you must remove the compressor wheel from the turbine shaft. Here's the assembly removed from the housing:
The "nut" in the center of the turbine wheel is ground to balance the assembly. Get that wrong and the turbo will self destruct. I doubt you want the debris going into your engine.
This is the kind of stuff you can find inside: