From the maintenance training handbook:
FSEU -1 energizes the flap PDU control valve with left hydr pressure to retract the flaps at load relief conditions. Flaps go to 25° from 170kts, and return to 30° when getting back at 165kts. Flap lever does not move, only needle on indicator moves.
load relief is only available on hydraulic operation, not electric.
FSEU-1 gets airspeed data from the left air data computer. No ADC inputs are shown, on my diagram, to FSEU2 and 3 from ADC right.
Now this could indeed create situations when the left ADC is going bananas.
However, the text also mentions that ADC alternate switching is detected by the FSEU. It doesn't mention further if this is for load relief or other FSEU functions.