Diagnosis
The pump manifold O-rings or seals have failed. This is common after winter storage if water was left inside and froze.
How to Fix It
Identify the exact leak source. If it's at the hose connection points, tighten the fittings with a wrench. If it's from the pump body itself, the internal seals are gone. You must winterize the pump. For now, you can use the machine, but monitor the leak. It will worsen.
If That Didn't Work
A crack in the plastic pump manifold from freezing is irreparable. The entire pump assembly must be replaced.
Heads Up
You must winterize this pump if temperatures drop below freezing. Use pump saver fluid or RV antifreeze. Running antifreeze through the system is mandatory to prevent freeze damage.