Looks like the root cause is the 2nd stage feeder. The motor runs abnormally fast and cannot grab the filament. Since the motor spins so fast it is unable to grab the filament and all you can hear is a high pitch sound as the filament rubs against the rotor.
Upon further investigation I noticed evidence of electrical over stress on main motherboard header “J13” and the mating connector which is where the leaked desiccant made contact. This happens to be the same connector that feeds the motor so it aligns with the symptoms.