It appears the water is coming out from underneath the black plastic cover cap of the unloader valve.
SOURCE: How do you clean the unloader valve on a power washer pump?
The unloader valve usually is replaced. I dont know if you can get o-rings for it. But if you want to take it apart, there will be a crown or cap style nut just below the spring. Unscrew it completely and you will be able to remove the spool. There is just a series of o-rings on it.
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