Followup: New , to me, MBP in the house, but ...

[nwyaker]

JoeH wrote:
If not water damage or bad solder joint, the problem could be from a card being inserted forcibly upside down. Have seen that happen to a few card readers we lend at the library, some people will just use force without actually looking at why something is not going in.

Thanks Joe.
I have visually inspected and cleaned out that slot with toothpick and air. It looks fine - no bent pins, no debris other than dust. I am leaning toward some kind of poor connection on the logic board, especially since the adjacent mic port is non-functional as well. Take apart in a few minutes.