Sorry for this taking so long. I opened up the controller and well I had to try and figure out what I did. Sometimes I just mod and just go for it, and when I don't take notes I have to figure out how I did the work. lol
I did another mod to this controller so there are ALOT of wires inside so a picture of the mod might not be helpful. Instead I did this diagram.
That is pin 2 on the IC used.
Now disclaimer, this is the best estimate on what I did based on what I can see. Make sure you test with ohmeter first. I didn't show where I got select / start from but I pulled it from the other 74HC157. I may have to work on this controller in the future when I will try and add those pinouts. But basically if you are doing this work then you can use an ohmeter and figure out where they go. Essentially you have a 2nd SPDT that swithces between Run / Select. There isn't trace cut needed on those ones.