i do not recommend aamco. there are too many horror stories where the customer is coerced into a rebuilt when it was not actually needed. but your results may vary.
i took a dodge pick in there years ago, and asked for it to be diagnosed for a flat fee. they said itr needed a rebuild and quoted a price. i could not afford the price , plus i wanted a second opinion. i asked for my truck back. their response floored me. they said the trans was in pieces on the work bench and that i would have to tow it.
i told them to either return my truck as it was when i brought it in or i was calling the police. and they did, 20 minutes later. this is not an isolated case.
the transfer clutch rebuild at the dealer runs about $1000, i hear.
if you do not have a trusted shop / subaru shop you frequent, i would probably spend $100 at the dealer to see what was wrong and get a repair quote. then you can shop around and see who , where, when, or if you want to repair it.