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Tektronix used good components, often the best money could buy. I would definitely not "shotgun" the unit and replace everything. You could have some issues with power supply capacitors; you may not. I would attempt a slow power up monitoring the capacitors in the power supply. If they get warm, they are bad. I don't know if the 545 has tantalum capacitors. The are notorious for failure and fail short circuit.
I have a type 531 vacuum tube Tektronix scope (1954-1959) and it still has all of the original power supply capacitors... and it works!
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