I have found that after some time the Router Boards RB433 and RB600 and some 411’s that have the green capacitors, leak their electrolyte.
I have found that replacing these capacitors even after board dies, brings them back to life.
Just a note for some that have these boards, and want to breath some life back into them.
De-solder them, replace with capacitors of the same rating.
I have numerous boards that his has happened to, I will admit, that we are in the tropics, and heat could play a role in them going bad.
The newer boards don’t tend to do this though as they have different components.