Lamona oven hja3320

I don’t know if anybody can help or not but I’m in need of a wiring diagram or advise on how to wire up the lower element in this machine.
I’ve just been to it and 3 of the 4 wires going to it have completely burnt off with no trace as to which went where.
It’s obviously a double element 4 contacts. The left hand is still intact (blue) but I’ve still got a grey, a red and an orange.

If anybody can help it would really be appreciated.

Thanks