This is in a F3A trailing unit that I added a RS Commander along with the LCRX. The old boards were toast and had been gutted years before.
I have placed (2) 3mm LED's in the holes normally used for the engineer figures for cab lights, and will be using a 5mm in the headlight bracket on the PWC series F3's.
This has worked well with ERR CC, DC commanders and RCDR's, so when I get it figured out, it will be similar to the other engines upgraded in how controlled and works.