Dear Customer,
The model of the pump is BPTA-PS1-PWM.
Here is the link. When you login, you can make a purchase.
You just need to loosen the four screws and then replace the pump.
If possible, after reinstalling the distro plate,
please perform a leak test to ensure everything is working properly.
(The input pressure should not exceed 0.35kg/cm2 (bar), and do not over 30 seconds.)
https://shop.bitspower.com/index.php?route=product/product&product_id=7215&search=S1