For me it looks like the problem with the power unit A1 (this is the big module linked with the traction motors).There is the set of unipolar transistors + lots of other electronics on top
Hope I'm wrong, because it's pretty expensive part.
Perhaps you have some other 335-02 truck to "borrow" A1 and to check it.
Of course, I presume, that the battery is OK, fully charged, no short circuits etc.
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