This morning before I arrived at the nest, the fledgling was joined by a sibling on the Starbucks fire escape. By noon both had returned to the nest. The mother fed the youngest eyass this morning, and she did not bring food to the fledgling. I suspect as a single parent she wants them to stay on the nest a bit longer.
A rehaber inspected the fledgling with the limp this morning and found nothing wrong with the bird. I believe the visit was unnecessary, but it's good to have an professional opinion none the less.
This nest is in a dangerous location, so there may be more drama later in the week!