You will have to sort the sounder tamper first Billy because it's hard to say if the panel has been set up for user or engineers reset at this stage.
If you don't want to get the ladders out, then you could always link out the sounder's tamper terminals inside the endstation, so it doesn't see the tamper,then try entering your user code then hitting the tick button.
If the "spanner" remains lit and it still asks for a reset,then you need the engineering code for the reset, probably changed from the factory default code you mentioned for one chosen by the installer and unknown by you.
We can't tell you on here how to default the codes for security reasons,but I'd also suggest finding the engineering manual from the net and having a jolly good read,and again Billy we can't give you a link for this manual either for the same reasons.
If you want to try linking out the sounder TAMP terminals then it's in the manual,but always isolate mains power to the endstation before you remove the lid.
I'm expecting a tamper alarm when you remove the lid but just enter your user code and hit tick to silence the alert and carry on playing :).
Good luck and I hope this info helps a little.
Ps it's all there in the manual,download it,read it then read it again.
Pps there's two tamper micro switches on the sounder, lid and base/wall.
e manno, August 2013