Ok, I think I have a solution for you.
First, open up the preamp and dry of what you can.
Second, take alot of photos of the inside from every angle you can
Third, get some small paint brushes
Fourth, if you are comfortable, take as much of the interior apart as possible and set aside
Fifth, buy some of this https://antiickypoo.com
Sixth, with the small brush dab/lightly paint the affected areas with the solution. Leave on for a while then dry. Repeat for every area.
Seventh, let it all air out and be completely dry
Eight, reassemble and fire it up.
It will either work or it won’t and you will be out only the effort and less than $100. I hope for your sake that it works. As an aside, where did you get that crazy price for the main board?
First, open up the preamp and dry of what you can.
Second, take alot of photos of the inside from every angle you can
Third, get some small paint brushes
Fourth, if you are comfortable, take as much of the interior apart as possible and set aside
Fifth, buy some of this https://antiickypoo.com
Sixth, with the small brush dab/lightly paint the affected areas with the solution. Leave on for a while then dry. Repeat for every area.
Seventh, let it all air out and be completely dry
Eight, reassemble and fire it up.
It will either work or it won’t and you will be out only the effort and less than $100. I hope for your sake that it works. As an aside, where did you get that crazy price for the main board?