Water in and on drip tray

I am trying to repair a (1^st gen) Jura Z5 Impressa coffee machine and I hope anyone can help. I've found the online repair guides which have been very helpful but I'm unable to find a fix for my problem. So far I've taken apart the brew group and replaced the rings; I replaced the entire drainage valve. I've also cleaned and partially replaced the outlet valves and decalcified and cleaned the machine using tablets. The machine works and the coffee is fine but I feel that there's a lot of (brown) water in and on the drip tray. Also, I noticed that during decalcifying, no water came out of the outlet but it did make a sound. Does anyone have any suggestions?