I picked up another B&K 2040 a whilke back I need to get going.
Last time I tested this unit it produced a wide signal on the output and no matter where you set the channel display out it was the same. However the 455kc section operates as designed.
Someone added a multi 6 position switch to take this unit out of the normal band. Most likely it has a VCO problem as the 2 10.240 oscilators are working.
I will be poosting my findings in this thread and have attached the service manual.