Replace the leaking part
Replace the part it is leaking from.
Increase the gland steam pressure if air is leaking in. If gland steam is leaking out, replace the seals. If the leak is in the casing, repair or replace the damaged parts.
Find where the fluid is coming out and repair/replace it.
You don't. They are not difficult to replace.
No just find out where the leak is and repair it.
If it is leaking, then best to replace it.
If you have a (casting plug) or what is commonly called a (freeze plug) that is leaking the only repair is to replace it.
It would be best to replace it with a new one.
Dig it up and replace the leaking section.
If it is the pump seal - replace the seal and other related gaskets. If it is the pump itself - replace the entire pump.
Repairs on the newer air conditioner condensers are almost impossible to repair. The best thing is to replace it.