NRG Control PA1 remote control

I lost my NRG PA1 remote control for this preamp. As the company no longer exist, I will need some help with knowing the codes so I could program it into a Logitech.

Or someone could show me the ropes on how to find out the codes?

Otherwise, I would greatly appreciate, however unlikely, for some kind soul to lend me his NRG PA1 remote control so I could teach the Logitech.

Thanks in advance.