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Or maybe anyone has an idea of a dix I could do.
They are A1304ELHLK-T, package is the SOT-23WDigikey has them - https://www.digikey.com/product-detail/en/allegro-microsystems-llc/A1304ELHLX-T/620-1548-1-ND/4552949
Nope, I just make all this up as I go. The Hall sensors do not have a constant power rail, it is turned on/off 125 times a second via U9, so a DMM will not measure the voltage correctly. You need to put a scope on there if you want to see what it is really doing.