[GoFast1965]

I'm asking some help from this fantastic community. My relatively new to me ERA Cobra will not start. Below is some context.

This weekend we started it up for a drive and it was making a high pitched whine almost like a super charger. I backed out of the garage and it continued. We shut it down in the driveway and it would not restart - just a single click from the starter solenoid relay on the firewall.

Here is what I've done so far.
1. Battery is fully charged and tests at 12.6 volts.
2. I show 12.6 volts at the starter solenoid relay input.
3. I show 12.6 volts at the starter solenoid relay output when the ignition is turned to start.
4. I show 12.6 volts at the starter solenoid attached to the starter when the ignition is turned to start.

My current thinking is:
Either the starter solenoid or the starter itself has died. Is there a way to confirm before I start removing the starter/solenoid assembly? I hate to do so and then find out the problem is elsewhere.

Thank you for any guidance