Ok just guessing here but the mill light might be for the router itself which will be either a porter cable or a perske spindle. These are 115v supplied so although you have now sorted the 24v transformer you will need to see if you have a 115v supply.
Pretty sure the operators manual doesn't cover stuff like this & I was unable to get anything from spandex in the UK but you might have more luck across the pond. Spandex sold & maintained these machines.
To be honest I haven't really spent any time looking at the operating manual other than look to see if it had any technical info, will see what it says about operating. To be honest I hadn't thought to much about what came out of it although I did put it away rather than throwing it out as I knew there were still a lot of these machines being used.
If it's the side the control box is mounted to then yes there was a gland plug on my machine, can't remember what ran through it but sure as well as something to the control box there were wires to the emergency stop/power on switch.