My Lost World was plugged in and operating when my area experienced a power outage last week. Unfortunately, when power resumed I reset the machine and operations were normal except for a loud humming coming from the speaker. This noise is overtop of the in-game sounds that are now quiet compared to the loud humming. I have not found anyone else experiencing this issue and don't identify any fuses in this circuit.

If anyone has any suggestions please reach out. For now operating the machine with the speaker unplugged.