[TenTec] 565 Version 2 logic mod??

[NZ8J]

I'm looking at an Orion 565 that I may buy, but the owner doesn't think
the hardware mod has been done. He says it has the latest firmware
installed however. Is there a way for him to confirm to me that the mod
has been done or not?  He had it back to Ten Tec recently for a battery
replacement and service. I don't know if Ten Tec does the mod as a
matter of routine or not.

Not sure I'm making sense, but maybe someone has an answer.
Thanks 
Tim
Nz8J