Thanks for all the help. I had a "T" fitting under the stove (more like an X). Looks like the main line that runs to that fitting, then one to the stove, one to fridge, and another to the hot water heater. The fitting at the X would not budge and I think any extra torque was putting some stress on the copper piping in general. I ended up cutting the pipe running to the fridge and capped it with a 3/8 flare and flare nut (learned something new-how to flare a copper pipe). Checked with soapy water but going to get a little portable detector with a wand to double check everything. So far, so good, definitely don't hear or see any bubbles.
Best,
Luke