Is Channel D audio gone out of business?

@skkmber 

I dont know if you managed to fix your Lino,  but yes that cliking sound is most likely the battery.  The replacement battery is a Powersonic PS-4100 Sealed Lead Acid Battery, you wont be able to close you lid anymore and the pins are less wide so you might have to tighten them, in my case I had nothing to do with the connectors, it was a nice and tight fit. 

@charob 

Thank you so much for the response and for your helpful advice. I will go ahead and order the replacement battery and hopefully that will fix the issue. 
Thanks again!

I picked up a used VDH Grail SB after MFremer said a used Grail was a sonic bargain

Michael Fremer wrote an obituary for Rob Robinson back in January which I missed: https://trackingangle.com/features/rob-robinson-rip

In the Q & A section, there is  information regarding the status of Channel D. 

I went to the Channel D auction last week. The house was full of all kinds of Seta and Lino circuit boards, along with a huge number of capacitors and other electronic components. There were also a few faceplates, but no complete, genuinely working Channel D equipment.

I spoke with the auctioneer, and it sounds like the family's lawyer is holding onto all of the computers and hard drives because they suspect they may contain the intellectual property (IP). I think the family knows the IP is stored somewhere in digital form, but they have no idea where. All of the computers are iMacs. Even if they knew which computer, the hard drive is most likely encrypted, and without the passwords or encryption keys, there may be no practical way to recover it. Unfortunately, this could end up being a total loss.

I carefully searched every corner of the house and found no sign of any paper copies of the schematics. The only documents I found were a few user manuals (the same ones already available for download) and some advertisements.

Based on what I saw, I think the chances of reviving the company are quite small. Even if the family eventually finds the IP (i.e., the schematics), they would still need to sell it to someone interested in continuing the business, and that process could easily take years.