Sorry, I wasn't clear, the Evergreen Hospital MM setup I already located a while ago. The eNBs for those were: B6BD7, B6BD9, B6BDB.
I meant for the cluster of MM which I can't locate in Kirkland. Just like Totem Lake and the John Muir school, there are three MM nearby with their eNB separated by 2 digits and one reports as an MM/SC. As expected, SE03XC353 tends to overwhelm them in most normal areas, making location more difficult. It seems that their job is to fill in the "shadows" for SE03XC353. My guess is all three are located at the aforementioned Clear site in Kirkland, but I am not 100% certain on that yet. I will drive around to see if I can collect better data on CellMapper.
As an aside, it seems like it is common in a cluster of three for one of them to report as an MM/SC on SignalCheck. Even the one I found which had the last eNB off by one, instead of two, still had one of them as an MM/SC.