MAN Fridge

I’ve just been upgraded from a 08 plate man tgx
to 16 plate tgx.
The 08 had a factory fitted under bunk fridge
the 16 plate only had cool box.
One of the fitters kindly swapped the coolbox for the fridge but told me after lifting the mats etc he couldn’t find the multi plug to power it.
He’s told me it may have to go back to main dealer for the wiring loom to be looked at / sorted.
Has anyone any knowledge on it ?
Is it a 12v or 24v fridge ?
Can it be temporarily powered from
Hella socket with in line fuse ?

take a multi meter to the "old " one and find out what voltage was being used to power the fridge . I’m sure you could wire up a supply based on your findings .