Hi snapdragon, thank you for your advice. I removed the trim above the window again. I only found one earth wire there, and it appeared to be OK. However, I tried if removing makes any difference to the radio when the rear window heater is on - it didn't. I couldn't see the suppressor(s) - I found a picture and I think I know how it looks like.
I'm still thinking is that amp working at all... one would think that removing the earth cable would make some difference to the radio.
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