I believe it could be the soleus, but not 100% sure. My PTs could manually squeeze my calf to verify that moves my foot via the achilles tendon, so the tendon seems ok. It's not very painful - unless I attempt to put weight on it in a non-flexed position, then the muscle wants to contract to be sure not to stretch. Any sore sensation is higher up than where the tendon attaches, AFAIK.
Seems to be getting well quickly, but it's annoying to use crutches, but it's more annoying to not move around so it's ok.
How did you tear your soleus those 2 times?
Edit: taking a quick look at this:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2697334/ - seems like "tennis leg" is what happened to me (only sudden acceleration playing soccer instead). So probably not soleus. It happened under fast twitch activity.
Edit 2: the main tender spot is right in the center. Hmm. No idea what that means.