Hello,
I have been working on a Japanese MD2 model.
It came without the power led but the rear panel has a hole that suits a 5mm Common-Cathode Red-Green LED for the purpose.
I have used 220-ohm resistors in series to each anode considering my Arduino is supplied by 4.8V.
The test points and arrangement are shown in the following attachments.

SSL-LX5097IGW.pdf