This is a 754 that PO put in our 380SL. Sounds good, display is a little wonky, but the big thing is that the presets just don't seem to work. Some trick I don't know about?

You can push the button and hold it forever, the preset never changes. They are all local stations so I know that they were set somehow. Any ideas?

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1985 300TD
1984 380SL
1983 280SE (full Euro, trunk triangle and all!)

Formerly owned:
1986 420SEL
1984 300D
1983 300D
1981 300SD
1976 300D