I lived in Anchorage for 3 years while stationed there for the Air Force.
Alaska Leather is TOP NOTCH! Barb is an adventure rider her self and has ridden from Prudehoe to Argentina. they'll take care of you in Anchorage or Kathmandu. they don't do maintenance other than swaping tires if you remove them from the bike and bring them to them. but they sell anything you need. (and will ship to anywhere. I live in mississippi and have had jackets shipped direct from vender from them, if they didn't fit I shipped them to AK leather and they re-ordered the correct size no issues or extra cost to me other than shipping it to AK.)
The Motorcycle shop is another great shop. they did a lot of the work on my sport bike while i lived there(changed to dual sports AND doing my own maintenance since leaving ak... but not because of them) good prices and quick service
the only shop I'd say stay away from is the Suzuki, Kawasaki, ArticKat dealership in Eagle River (30min outside of anchorage) I bought my bike there and will never return again... they tried every which way to change the deal... even after I purchased it (but haddn't picked it up) even tried to hide my bike so that I couldn't pick it up with out agreeing to their "new deal"
there are a couple more in anchorage... but personally... I stuck to AK Leather or the Motorcycle shop.