There is not any dial codes to turn Night Mode On/Off
You would have to program a night key on the operator phone to deactivate it
Or someone remotely could program the auto night feature to roll the system out of night.
then turn that off.
Both would require someone to remote into the system via the modem (If it is working)
and set that up.
Only other thing I can think of if the DSS isn't working would maybe try plugging in a phone into
the cord/jack that the DSS use to be plugged into and see if the phone comes up and you see a key
that is lit (Hopefully that would be the Night Key) and try turning it off.

If you want to try the remote thing your welcome to send me a private message with your office phone number
and I can attempt to remote into the system and program a night key on the operator's phone. That would
be best. If my memory serves me right there was a software version that had issues with power outages and resets
activating the Night Feature. So the issue may come back. But at least with the night key you could control it from
the operator phone going forward. And hopefully that phone has a spare key that can be programmed

MC601

mjc