Replace the seals and gear sets
To repair ABS hydraulics locate the ABS modular unit and drain the brake fluid. Close the bleeder and turn off your engine, then refill the reservoir.
what government agency will give me a grant to repair my heat pump
You cannot repair the water pump. It needs to be replaced.
AsWaterpump repair
To repair a pump first determine how the pump is broken. In many cases the hose needs to be replaced.
A big component of hydraulic pump repair is replacing worn out or damaged parts. If you can get aftermarket parts, that would significantly reduce the cost of your hydraulic pump repair.
Possibly it does not have enough hydraulic fluid, or perhaps they hydraulics are not sealed so they won't pressurize.
Margin pressure is a term used in Closed Center, Load Sense type systems in hydraulics. The term refers to the pressure difference between the pump outlet(valve inlet) and the valve tank pressure). The margin pressure is the way the valve signal to the pump it's status.
You would need a sump pump repair if the sump pump in your basement is not pumping out water. The purpose of a sump pump is to drain excess water that is part of your waterproofing system.
You cannot repair the pump when it fails. Normally the diaphragm will bust. You must replace it.
You don't repair, you replace.
You can't ! Remove it and get a new pump.