HTS10 pops and flash after circuit board replacement

Hello everyone, my HTS10 had its circuit board replaced under warranty after it started emitting speaker sounds by itself. The repair worked. The sounds have ceased.

Not too long after it had been repaired, there was a flash of light and a pop sound from the vicinity of the sub. Since then, there have been 1 or 2 other pop sounds, but no flash. The pop sound does not appear to be coming from the sub speaker.

The sub is otherwise working as expected. Is this a cause for concern? The only other device in the vicinity of the sub is a robot vacuum, but I'm fairly certain this is not the device from which the pop / flash emanates.

This is a 240V model, if that is relevant.

Thanks in advance.

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