Front companion flange on transfer case has machined hole. ATF fluid leaking from hole. Blow air into transfer case and bubbling ATF fluid emerges.
Called Isuzu (including Merlin) parts/service....no idea! Called Dans Drivelines....no idea! Looked in the Isuzu manual, picture does not show/reflect this flange.

QUESTIONS; What is the purpose of this hole, and why would fluid leak from this hole?