Liebherr refrigerator (vashon)

Liebherr model BFI 1051 bottom freezer/fridgerator combo. Panel ready, 24' wide.
The unit works, however the freezer struggles to maintain below-freezing temperatures. The upper fridge part works fine. I've had a repair person diagnose the issue. It's not a coolant leak. It's a problem with the control board for the freezer section. Replacement control boards are no longer available according to my repair guy. Before I toss it, I'm seeing if anyone is interested: the top fridge works, the bottom freezer doesn't really work as a freezer anymore, but could be a second fridge compartment.