Just to close out this topic…
I checked the vacuum as described by TT…it was fine. I do not think the fluid is leaking past the seals because the fluid level is not dropping.
Offline TT suggested I readjust rear brakes as that might improve the pedal range. I did that IAW the WSM.
I took it for another test drive to test the brakes. The brakes performed well even under panic conditions. The pedal range also seemed to improve.
At this point, I am not convinced I had a booster problem. Might be a slight case of “chicken little.”