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sansui qrx 7500a trimmer problem help.

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    Sansui QRX-7500A both rear channel offset trimmers VR03 and VR04 have no effect

    I am repairing a Sansui QRX-7500A. Relay clicks reliably. Front Left and Front Right channels have good DC offset and trimmers VR01 and VR02 respond normally. However Rear Left is stuck at 138mV and Rear Right is stuck at 477mV. Neither VR03 nor VR04 trimmer has any effect when adjusted full CCW...
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