Where are you located? In Toronto there have been 3 or so AEG workshops hosted at TTAC3 by a user on this forum, M102404. I attended and it gave a lot of insight and practical knowledge on repairing AEG's of all types.
Like most technicians, they either taught themselves or were shown by someone else; There isn't really any other way. Take your time and don't rush.
www.mechbox.com has a lot of information, so do the forums here for unique solutions.
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Ár skal r?*sa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.