Who Me Too'd this solution

Thanks for the fast suggestion, which led to the solution, though indirectly.

There is indeed an Advanced Setting controlling the LED lights.  But that was set to On. 

But there is also a physical switch on the back of the router that overrides the software Advanced Setting.  Who knew?  That was set to Off.  Not sure how it got changed, but, when switched back to On, all the lights came back on.  

Thanks again.