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Reply to "Legacy SD70ACe Acts Up"

The fact that the whistle/bell buttons generate the sounds suggests that the RS board is not seeing serial data.  My guess is the R4LC is either loose or out of the connector.  If not, then it's likely it's failed if it won't run in conventional mode.

I don't see the headlights, they should come on in conventional mode.

Did you shake the engine to see if the R4LC is rattling around inside?

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