help with part identification

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Trying to repair an amp with missing power/output parts. The factory Heat Sink/Chrome casing has Memphis audio and ST1500 printed on it?

I beleive the missing parts are either NPN or PNP transistors but I can't confirm that nor the original part#'s or correct locations.

Included a close up of removable power supply card in question, along with a picture clarifying missing part locations. Please let me know if you see any additional missing items on the card too, capacitors, resistors, etc...

Thanks guys, this is my first post!!!😀
 
amp repair.jpg

amp repair 2.JPG
 
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