First I'm not a JURA tech. But I have worked on similar table top "Super Automatic" machines. You should call your vendor for service as there is no customer serviceable parts in this machine.
*** the following is for information only. ***
* If your leaking at or under the water tank then check for crack or you may be missing a rubber seal, o-ring, or washer. Replace the whole tank as a unit.
* If your leaking into the dregs or drip tray then there is a problem with the brewing system. Call for service. They may need to replace the brew valve or PC board.
* If your leaking at the bottom, drip tray, or side only when the pump buzzes (pumping water) then there is a cracked or disconnected hose line or fitting. Call for service and replace.
* If your leaking when the steam wand is in use then there is a similar problem with the 2nd pump system. Call for service and replace.
* If your leaking liquid coffee into the dregs tray or drip tray. Then you have a worn or missing group gasket(s). Call for service and replace. (you may find gasket kits from Amazon.com or online.)
* Final; Leaking water and electrical equipment is not a good idea. Best to be safe. Unplug and call for service.
Aloha, ukeboy57
PS: I've found the following video of a look inside the Jura;
https://www.bing.com/videos/search?q=jura+ena+3+leak&&view=detail&mid=741EFC1C3BEF3B6D9A49741EFC1C3BEF3B6D9A49&&FORM=VRDGAR
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