Sanwa - 701B Portable cassette player

Well-preserved radiorecorder Gethoblaster Radio plays both cassettes; the tape decks run well.
Small problem there is with the balance and volume potentiometers; I think they are dirty and should be cleaned.
Recording function not tested.
Please look at the picture where my finger is pressing; balance turned to the right; the right speaker does not play when I press volume, the right speaker plays normally. Please examine the pictures carefully before purchasing.
One would need the balance and volume potentiometers; could use contact spray.
The radio is from a collection; age and storage: last 35 years in a basement shelf.
Both decks run well; the speakers show small bits of light blinking when playing.
Please inspect the pictures carefully and read the text closely so there are no misunderstandings later.
The radio will be well packed and insured for shipping.