[Engineer's Code]

Hi we have a GT490X that occasionally complains of 'low-volts' or something similar. I assume it is the backup battery packing up. I would like to investigate changing the battery myself, or at least put the job out to tender. The alarm is a 'non-maintained' alarm, but has been recently worked on by the original installers ACE. Do I need to request that ACE provide me with the engineer's code? If I do, should I expect that they would do this? Would I be able to change the battery without it, or would I risk setting off an anti-tamper system that I could never reset by just using my normal password? As you can probably tell, I don't even know enough to be sure I'm asking the right questions even. I don't mind paying out but feel a little irritated that I might be tied to ACE. How should I proceed to ensure I get a fair quote on this job?

 

Any help much appreciated