The early Philips V2000 machines - VR2020/2021/2022 - were desiged to have "add ons" - a remote control kit and an AV adaptor were produced to plug into special sockets on the machine.
See
http://www.totalrewind.org/v2000/V_2020.htm
The AV adaptor (I cannot remember the type number, someone on here will know) plugs into the rectangular "aux" socket and provides BNC and DIN audio and video connections. This module is quite rare but they do come up for sale from time to time.
The audio issue in your machine is more likely to be to do with one of the many plug-in modules that the deck uses and would best be resolved with the help of the service manual for the model. They were very complex machines for their day and used many IC's for signal routing. At this age there could be a number of component issues and the modules were also known for bad soldered joints.
Nice machines when they are working, and the 2022 was one of the nicer looking of the range I always thought.