From what I've heard many of these refurbishing companies don't have proper test procedure or means to repair pressure sensor or pre-charge pump related problems. So even if BBA-reman or ECU testing is saying the module is OK it usually just means the wheel speed sensor circuits are OK. If you are stumped and don't have another module to test with I would probably ask ACtronics opinion about the module.
https://www.actronics.co.uk/