hi, I bought this solid panasonic walkman for 20 euros. besides the straps to be replaced I noticed that the play button remains a little recessed, the 2 rewind buttons instead do not remain selected. the rec key instead remains blocked (playing with the mechanics I was able to set them, but it does not always happen) do you have any advice? (it's my first post and I'm not very good in English, I apologize in advance)