Hi Stefan,

There is a 0.1uF capacitor on the bottom left of the board. Its connected to the yellow GUNTHER relay.

That is where the speed reference is stored as a voltage. That one, when it goes bad, will manifest as slow loss of speed over time.

The joints can look fine but when you go through them slowly one-by-one you may notice something you didnt at first glance.

If you can, I'd replace the two 47uFs and the 0.1uF.

--Kris

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