The manual was very accurate for the part that I was changing, I was able to order the correct part and had no issues with the replacement procedure. However, I was expecting to have more detailed repairs for the lower drive unit.
Text excerpt from page 9 (click to view)
MDX-M690
Note: Follow the disassembly procedure in the numerical order given.
3-2.
COVER
1 screw (PTT2.6 � 6)
2 cover
3-3.
FRONT PANEL (KEY) ASSY
5 Remove the front panel (KEY) assy in the direction of the arrow.