Guys, last night I finally attacked the toilet. Could not find any "screens". Took apart the incoming line, the brass spring holder at the bottom and the vacuum breaker (behind the toilet). Nothing. Then I further dismantled the vacuum breaker to find that the opening out to the sprayer was never opened (to allow water to pass). After drilling it out, I now have water, but it trickles out of the sprayer.
Any ideas? Guess I'll have to contact Dometic directly?