I hope you didn't buy a new one, ours stopped last week after 25 years. All that was needed were new brushes for the motor. Anyone with a screwdriver could replace them. 4Kenwood had the parts to me in a couple of days.
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A failed SCR or triac will not always show visually any sign of failure. Chances are good that is all that is wrong. If mixer had been plugged in when it got wet, that is all it takes. Also check the transient voltage supressors if the chef has them. They would be identified on the circuit board. as TVS or MOV along with a number. Only number to use is the one on the component.
If you can find ratings for the old devices, just matching the basic ratings should do. Just guessing, but the SCRs should be 20 amp and 400 volt, If the old ones are a lower rating than my guess, there is no problem with using the higher ratings, if my guess is low, go with the original's ratings. Manufacturer of device does not matter as long as ratings are at least comparable.