An update - no success yet.....
1. the plastic hose at the front - uncoupled, it did drip out some water; a few tablespoons. Also when you shake the tubing inside the frig, you can see water moving at the open end of the tube when uncoupled.
2. My voltage meter is pretty much worthless. Got no consistent readings.
3. Ordered the part - the valve you sent me the link for. Just in the past hour am done installing it. No difficulties. Yes, it does vibrate when the ice maker demands more water - BUT, no flow still to the door water dispenser. Took out the new filter cartridge, re-installed it - still no flow.
4. Now I wonder could it be this part that is the problem??
The Micro Switch, part # 324439 which is behind the water dispenser in the door panel. Link: http://www.partselect.com/PS324439-Whirlpool-2162361-Micro-Switch.htm?SourceCode=1&SearchTerm=KSBP25FKSS00&ModelNum=KSBP25FKSS00
So - do I get a volt meter first to test the new part? or order the Micro Switch?