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The only boards in the PL-518 are the power supply boards. And you can take and make a list (2 transistors & about 8 electrolytic caps) from the schematics. Service manual here. http://www.kallhovde.com/pioneer/Pioneer/Main scan page.html Scroll down to PL-518. Verify schematic values with the actual boards. If there are differences, use the values on the BOARD.
2sc945 = 512-KSC2383Yta in stock Mouser. $0.46ea
2sd234 = 512-KSC2073TU in stock Mouser $0.65ea
Download the DATA SHEETS for both transistors for the PINOUTS. 99% chance of them being different than the originals.
I would use Nichicon UPW or UHE series for the Electrolytics. Leave the Film and or Styrene caps alone.