Vintage Tube Amp

Vintage The Fisher 500C FM Tube Stereo Receiver Amplifier (Most Original Tubes). Pre owned in working condition. I assume from the age, a cleaning and deoxit could be usefull. This has many original tubes The Fisher Germany. Missing gold round knob end plate on speaker selector knob. When testing the balance knob when turned all the way to the right does not direct audio just to right speaker. Left is fine, and when balance is centered, both speakers play correctly. I assume the potentiometer knob needs deoxIT due to age and oxidation. Please see video and photos, if you have any other questions, I will try my best to answer. See pics above.