Looking For OS For Kohler KD165 Digital Piano

Hello there, I have been looking for a Korg PA80 main board working or not, and I found two of them on ebay supposedly not working, but one was actually working and the other just needs a minor repair that I can do. Now the reason I needed one, is to be put into a Kohler Digital Piano in which uses the Korg PA80 electronics. Well I was able to swap the eprom out of the original board of the Kohler as it is an 88 key piano, so it needed the eprom for the firmware. Now I need the OS for the Kohler KD165. Maybe you could help me find this. The files are OSPa.LZX and BPa.sys and NBPa.sys Thank You!