Altec-Lansing ATP3, some foil missing from circuit board at DIN cconnector

[MechanicalGenius]

I want to HACK this unit into a stand-alone operation and control.  As luck would have it, three short pieces of "foil" circuitry have been torn from the board at the DIN connector.  The missing pieces only go to one or two solder points distant.  I want to "replace" these missing "foils" with solder, foils, electrical paint, wire, etc.  Can some body set me up with a schematic or, preferably a photo of the circuitry leading to the DIN.  There is enough there to "guess" the circuitry, but why take a chance with all the help available.

I would be grateful for your help and it would be fantastic to me!  (My handle is "Mechanical Genius", not Electronic Genius -- I know my limits.)  Anyhow email me your solutions.  And ya'll stay safe and keep up doing all the good you do.