Turbo diesel - Oil in intake manifold

I have a 95 series Prado with the 1KZ-TE diesel. When I changed engine oil and filter today, I noticed oil leaks around the throttle body which connects to the intake manifold. I investigated the leaks by removing the throttle body and intercooler, found enough oil inside the intake manifold to be able to wipe it up, plus traces of oil (enough to blacken my finger) on the entry throat to the intercooler. Fins also appeared slightly oil coated.

This would seem to indicate leaking oil seals in the turbo charger. It had used a slight amount of oil between the last 5k oil change but not really enough for a top up.

Is my assessment of leaking turbo seals correct?
How urgent would it be to fix the turbo’s oil seals?

While I’m fairly mechanically proficient, I don’t have a dial gauge to check end float or turbine shaft runout and I haven’t set up a turbo previously.

Any suggestions for repair?

My preference is to remove the turbo myself, have it repaired by a professional and then reinstall it myself. I’m in Sydney so any recommendations are welcome.

Peter