Its enough that one of those junctions or curves have a partial blockage to lower the pressure on the entire system.
It might also be be that the pump motor has reached the end if its service life, its a very easy replacement. If you see lower pressure, try tapping the motor on the rear of the machine and try flexing and squeezing/pinching the visible or accessible hoses with your fingers and see if they spit out any gunk through the spout at the upper trough. The mesh wire filter should catch most of it before its sucked back to re circulate.
Processor clean can help loosen up the gunk as well.
Let me know if you still need any help.