So I tried to do the MOSFET mod to my BK2K lamp matrix using an IFR9Z34N MOSFET. I tried a MOSFET on Q87 and a zero ohm jumper on R134 as a test and about 4 lights were stuck on. Does anyone know what I did wrong?

Thank you for any help.

Afternoon bump! I forgot to mention that I am using LED's and am not sure if that would cause an issue. Thanks.

Thanks for the reply Chris. After really looking at the schematic, which I'm not at all proficient at, I realized I was changing out the lamp row section and not the lamp column section. Once I realize that, I completed the mod and everything's working great. Thanks again for your input.

I haven't seen data either but a simple touch of that row of hot resistors is all the data you need!