Panasonic KX-T336 System Reference Manual page 1510

6.00 Return Messages
=> DN4000
2
***** Executing
3
4
1 COMMON 2
Message
Executing
Illegal Parameter
Invalid status
Pass
Failed
Display on message line when executing test
Message line
3 4 5
Description
Executing device test
Entered parameter is out of format or related device is not installed.
The status of the card or port being verified is not "OUS" or "Fault."
Device status is good.
Device status is bad.
14-F-15
6 HRD CPY 7 8