Need some help/guidance with Krell 700cx

Hi, all… looking for some major help. My father passed away and I’m needing to sell his equipment. He left me a vague letter stating a value of the system, but I think I’ll need to break it down and sell it piecemeal.  I have tried local places and no interest, but I really need to know what I have and value everything. There is the Krell700cx, Krell current tunnel, legacy speakers, Theta Data III transports, Theta DS Pro, Theta Series II universal transport, a subwoofer and ASC tube traps. I also found a small set of Epicure Fourteen speakers. I saw some boxes in the garage attic but haven’t gone up there yet.   I don’t know how to work it to proof it, not all are connected and set up, so I’m not sure what works and what doesn’t.  Where can I start to figure this all out??  I was lead here ….