This is how i checked the BJT's to find which probes were the base, emitter and collector using a multimeter in the diode check modes with no voltage running through the transistor. These are the readings you should get when teating each transistor to tell which is the NPN transistor or the PNP transistor and any lower readings of that voltage the transistor is faulty, refer to picture below. Also what helps is with transistors its similar to a diode but its 2 cathodes with a shared anode or 2 anodes with a shared cathode.
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