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Hi
Normally its only one transistor that's defective in the pack. I normally cut the corresponding chip legs for the base & collector flush to the chip body. Remove the legs and clear the pcb holes then just straddle and solder a BC548 across the chip body. Here's a Flash Gordon that i did recently. Thinking about it you could do this on the underside of the board hide the re-work.
Cheers Bob
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Worthing