Condition
Either of the following is observed:
Avaya J100 Expansion Module display screen is dark.
The expansion module lines are not displayed.
The action on Avaya J100 Expansion Module does not cause the corresponding result on the phone.
The action on the phone does not cause the corresponding result on Avaya J100 Expansion Module.
After the upgrade or downgrade is completed, the connection to Avaya J100 Expansion Module is lost.