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I just looked at the other thread on this and it says that the three lead part is a 2N6388. Depending on who made it, that's probably an NPN Darlington transistor with an Ic of about 8 to 10 Amps, about 65 watts max dissipation (with heatsinking!!! Your board doesn't have any heat sinking so...
ANYTHING can be rebuilt! It's just a question of weather it's worth it or not. But your board looks like it's easily fixable once you find out what the parts are and locate some replacements. Can you tell if it's a multi-layer board or does it just have circuit board traces on one side or both...