Dear PCB makers designers,
I recently got myself an old amplifier which circuit runs via two large area of PCB..
as its dark green in color and perhaps double sided PCB...
upon close inspection of the PCB I spotted two unusual sight... which near the diodes and transistor were soldered on i saw very unusual lumps/bumps which happens near the soldered areas of the PCB. its certainly not flux residue but due to my course of curiosity i then feel is with a wooden stick as its rather hard but it finally burst out spewing green colored mass ...i quickly stop it as am afraid that i may have in at course spoil the PCB or in another way causes it to erode the PCB.
i am puzzled if its a process flaw or its signs of early damage of the PCB due to extreme heat generated by electronic components ?
if i should remove the bumps/lumps and clean it with alcohol and lastly encapsulate it with PCB lacquer (silicon resin type) or epoxy over the areas ?
can anybody with good indepth of PCB experience advice me on what should be the best way to restore the PCB areas ?
thank you and i also attached the pic of the PCB with arrows pointing to the concerned matters.