If a disc error occurs, you may see the following error messages.

Transmission End Cover Air Check Valve Inspection and Replacement (A/T)
NOTE:
There are two types of the transmission end cover; the type A and the
type B; and both types are available.
The differences between the types A and B of the end covers are:
...
Changing Your Destination
There are several methods you can use to change the route destination. ...
Inspection
Install the nut on the damper shaft end, and set the socket wrench and
T-handle on the nut.
Compress the damper assembly by hand, and check for smooth operation
through a full ...