Proceed with caution and don't take everything you hear on forums as being gospel.
Talk to some reputable workshops, weigh up what they have to say, what they can offer and what they charge....but do consider experiences people have reported on forums, then make a choice. Don't get sucked into going from one workshop to another and playing one off against the other.
There are at least 5 reputable Subaru workshops in Perth from which to choose....

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No Subarus currently owned