Soap lumps in dispenser

Soap dispenser has left over soap lumps about 6 out of 10 times. Door is OK. I suspect that not enough water is getting to spray arm. There are 2 holes in a rear manifold that the spray arm can plug into. There are plastic flaps on the inside that appear like they need to seal to keep pressure up. The unused hole does not appear to have a tight seal over it when I look at it. If flaps don’t seal would this cause problem. It looks like manifold can easily be replaced by releasing a couple of clips. Is this as easy as it looks.

Henry

i would check the spary arms four debri clogging the end holes also let it fill put one glas upright in the top rack very back right and another glass upright in the bottom rack front left let it spray for 15 seconds if the glasses are full you have enough water if not i suspect a bad water valve there should be about a half - 1 inch of water in the bottom if not water vavle or not enough water pressure getting to the machine also you could cut back on soap