The middle spray arm was clogged after 7 years of NJ well water sediment passing through it. As such it didn't hose the Cascade completely out of the dispenser then the dry cycle turns what is left into hard paste and gums up the release hinge. When I knew what was wrong replacing the spray arm and dispenser would fix it. It could have worked had it not have been for my haste: If you are going to replace the dispenser on a GE Profile Triton XL or similar dishwasher you must first separate the access door from the interior panel to gain access to the dispenser.
When done the now clam shelled doors do not separate comfortably to make the switch easy, there is a ribbon cable connecting the 2. DO NOT pull on the ribbon cable to make access easier to disconnect it from the control panel. DO use Needle nose pliers or better 2 pair to pull the assembly out without damage. Then you will not tear the ribbons off their connectors like I did. - $75 used replacement panel on Ebay. New OEM $250. new Dishwasher: TBD Haste makes waste.