Other XC90 Problem: Turbo - it's out, what next?

[Mistero]

Following massive oil usage, and various other indications, plus a code analysis by the garage in Leeds, I summised that my turbo seals have gone, a fact verified by repeated DPF blocking, quantities of oil found in the forced air pipe which runs under the engine and the pipe from turbo to the air filter housing, plus the small volume of oil in the coolant header tank. Anyway, it's been a bit of a slog to remove it but the turbo is now out and being examined / rebuilt by a Garrett specialist.

So I have some questions on which I'd really appreciate some guidance, please.
1) What should I be cleaning / checking / flushing while the turbo's out?
2) Is there a special lubrication / coolant routine required when refitting and before the first start?
3) Is there anything else I need to be aware of?

Thanks in advance.