Well, finally a good report.<div>I said a prayer, and did one last thing. I switched the crystals, and.......no luck. I was in the process of giving up and I went to put the crystals back in their right places, and I got the one for the tank itself wedged and missed the spot where it was to plug in. I had the top off and so I removed the board to get it out then it hit me. The little board inside flexes when you push the crystal in  so while I had it out I pressed the crystal in and voila! Vroooom. Seems OK. </div>