Jeep keeps leaking coolant Any Help pleaz

[resourcefulmom]

I have a 2000 Jeep Grand Chereokee w/55,000 miles. No problems with it ever and always serviced on time etc... EXCEPT...
10 days ago the low coolant lite came on. Took to repair shop & had a pressure test done etc...new water pump,thermostat & Cap installed due to the coolant leak. 3 days ago it started leaking again. Another water pump was replaced due to a leak in the previous one. I guess 3rd times a charm because it is leaking more now than ever. I also noticed two drops of tranny fluid next to the coolant fluid on my garage floor. The mechanic says they can't seem to find anything wrong with it.
What gives?