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This is exactly the thing you need to service this box. The manual is complete and the quality of the scan is good. I recommend this!
Text excerpt from page 35 (click to view)
AH-X079E/X099E AY-X079E/X099E
Remove the board fastening screws.
Drain pan and related How to remove the gear box assembly Remove two screws which fasten the gear box assembly. Note When installing the gear box assembly, fit it, aligning the notch shape of the groove of the vertical adjusment louver.
the angle of transformer
the angle of transformer
Pull out the board.
How to remove the vertical adjustment louver Slightly fall down the hinge area, deflect the louver, and remove it at one place. Remove the shaft from each of the left and right sides.