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You have resistors on each end of the trimmer and an active device on the wiper pin. Its not going to test exactly right in circuit
If the half watt resistors are burned. 99% chance at least one transistor is bad, 90%+ all three are. If you don't replace the transistors the resistors will burn up again promptly. Replace all three transistors and burnt resistors and you should be good to go.
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