Welcome to NewLifegames and thank you for being a supporter.
Across the top of the forum is a downloads section only available to contributing members like yourself.
Looking at the pictures you posted (and thank you) the last picture seems to suggest this is a S-Slot and not a M-Slot.
There is often a tag on the outside of the machine next to the pull handle as well that might give us some more information.
In terms of navigating the downloads section
You would start at IGT Games, and drill down.
I noted that there is NO section for S-Slots but there is for M-Slots.
In the S+ section the manual that is there covers both S+ and S
Several members have S slots - so feel free to post and ask questions.
Here is a link to the two manual
/nlg/index.php?action=downloads;sa=view;down=4131On page 19 - (of the PDF) the motherboard pictured (crappy image) does appear to resemble your MPU
5 reel slots are not common over here in North America mostly 3 reel) but the S+ does support 5 reels if the supporting hardware (like the other two reels) are there.
I was in Auckland for a wedding in Feb, nice part of the world you live in.