HP-25 Keyboard fix, dissambely advice ?

[GreyUser]

Pores? On a printed circuit board, they’re known as a via. Plural is vias.

Removing the printed circuit board from the plastic plate is a very bad idea indeed and it gets you no closer to the problem which is easily solved from the back side of the printed circuit board.

Avoid disassembly of the heat stakes at all costs. The keyboard will never be the same even should you reassemble it somehow.