The original Becker radio in my 92 300E is not tuning well. Most times I turn it on, I get no radio at all. Sometime, it will play the radio, but not change stations. If I press a different station button, the numbers change in the face display, but the audio does not change. If the radio is working, sometimes I can change stations by pressing the button for the station I want, shutting off the radio, wait a few seconds, then turn it on again. Then it comes on tuned to the new station.
The tape player works fine. Amps and speakers are fine.
I assume I will have to pull out the radio and send it to Becker. Since this is the 2-piece radio and the tuner is actually in the trunk, anyone know if the likely failure is in the tuner in the trunk? or do I need to pull out the head unit as well? Anyone have experience with a similar problem?
Thanks!

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DavidB29
1992 300E with ASR
35 years of Diesels until now!