It is my life experience that those separate sink spray hoses just give up for no clear reason. My 2013 2100 was giving up so I just replaced it with the following:https://www.amazon.com/gp/product/B00TPUN81Y/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1Way less brain damage than trying to figure out why the spray will not work and you get a nice new faucet in the bargan.
How were you able to get in to remove old faucet?
I have 2011 2552 and my hand spray wand at the kitchen sink will only produce a very very slow trickle when pushing in the thump trigger. I took apart the sprayer and flushed and cleaned it and saw no or felt no obstructions from hard water cal. build up. When I push the trigger with a good water flow coming out of the facet the water stops and the slow trickle comes out of the hand sprayer. I turn off the facet and back on to get the normal flow of water out of the facet.I am thinking there is something causing a near blockage near the point of attachment of the sprayer hose. The sprayer hose is clear and easy to see any obstruction so I do not think its the hose. How does one get to the point of attachment as it is behind the sink I took a picture of where I think the blockage may be occurring.. your thoughts?