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ABS light intermittently 850

I have a 1994 855T and the ABS/TRACS light comes on intermittently. The OBD calls out a 444 code. I have replaced the ABS relay on top of the ABS module and tried another ABS module as well. Fuses all check out.
The code says "no power supply to hydraulic modulator valves"
I know with most cars there are chronic areas of failure and I am wondering if I am missing something obvious. I replaced the ABS relay on the advice of my mechanic who is now retired. It was old anyway so no big deal.






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