First, I already understand the basics of radio communication at this point, as that is all I've found searching elsewhere on the web for my question. (For example, How does NASA get information from space probes?How does NASA get information from space probes?)
What I really want to know is what a scientist might see at a workplace for tracking probes. Specifically, if something goes wrong with a major spacecraft, does someone see a literal red light start blinking? How can scientists find out when something goes wrong?