Looking into machine with tray assembly removed, using flashlight. I can see an inch or two of small black tube-like plastic or rubber hanging down near the flat round disc piece above the tray assembly.
From your description I would say a broken O ring seal in the brewing chamber. You will need to remove the brewing unit and clean, replace seals and lubricate the sliding guides.
As soon as I manipulated the black dangling piece, it fell off completely and does appear to be a broken O ring seal! Will update on progress as repair progresses. I'm so impressed by getting such a prompt and knowledgeable (and evidently accurate) reply! Thanks to Mr. Keen! Wow!
Update: while your answer is correct, my husband decided it would be worth replacing the entire brew unit, since very little time had passed since his last repair mission for this machine. We received the replacement unit and it seemed to fit well. However, when we turned on the machine, we heard tortured-sounding metal-on-metal grinding that alerted us immediately that the repair would not succeed. My F9 was 7 to 10 years old, and I used it A LOT. Sadly, we had to let go and set it free. LOVED that thing. I now have an Academia Gaggia, and it is gradually winning me over and restoring my will to live. Thank you so much for your help. Without it, we'd still be working on the disassembled Jura and hating life. Many thanks. Mr. Keen; you know your stuff! Debra
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