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You can’t test resistor value in circuit accurately

R17 and 18 voltages should be 9v top side of R17 and 0v bottom of R18 where they join should be half of the power supply 4.5v

Check the bottom end of R18 has continuity with ground touch the resistor leg with your meter probe not the solder joint

Post a nice clear in focus photo of the solder side of the pcb