The D4 light

I seem to have a D4 light which sometimes is on (solid) and other
times is not on. At first I thought the LED was failing but then in
the service literature it appears that D4 is used as a TCU diagnostic
readout. Do you think the TCU is trying to tell me something? From
online reading it seems that the "S" light would be lit in the case a
code was stored...

The transmission works fine, under load sometimes it upshifts at
higher RPM than it should, and when shifting under load it flares
(this is most obvious on 4-3 downshift), but it never slips out of
gear or fails to go into gear.

.

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