[reeferman]

Back in the old days if the set was working we would just tap the circuit board with the butt end of a 1/4" nut driver (making sure there wasn't anything with long leads on it). Worked quite well. For items like power resistors or around items where the PCB is heat discolored at the joint just re-solder them...but...it is not uncommon to have to remove the component first to clean up the leads. Then reinstall component and solder to the board. If you apply too much heat to a dirty lead and PCB at the same time the PCB copper trace always loses. Take your time, hone your soldering skills, and have fun.
Phil