You can swap the loop cards around but you have to swap the eproms on each to keep the correct loop data.
Powering it down and back up again will not cause loss of data BUT be careful that the links aren't in place on the loop cards and the main board or it the configuration data will be erased.
The mesage doesn't sound quite right but I reckon that you have a problem on loop C (which is the 2nd card).The quiescent loop current has exceeded 4mA and can be caused by a faulty device (s) or a wiring fault causing loop leakage.Check your loop analogue value when this comes up (fast access 0062) and see what it's sitting at.
Bear in my mind that 2010 is approaching where support for these panels is being withdrawn - they are already considered obsolete.
Very useful advice, I had noticed the EPROM’s on the loop cards, not like other makes have EPROM’s on the main PCB board, and that's the main suspicions...
I had checked that day, the analogue values only loop C had weird readings, some values 8.8 till 9 some others very low till 1 and 0 mA.
However, I tested all zones covered by loop C all worked OK; I mean one device in each zone, including the one shows 0mA value. This did not make sense to me.
Regarding the message: below 'non-addressable' it was displayed 'C' and below 'point' it was '1' I am not familiar with ADT stuff!