R620 finding System Board PS Redundancy Main System Chassis

I have the following errors in the alertlog for an R620 with dual redundant power supplies, but am unsure where (or what) the Main System Chassis/System Board PS refers to.

The status for the power supplies come back as Ok.

Any suggestions for how to debug this would also be appreciated. Thank you.

Severity      : Ok
ID            : 1304
Date and Time : Fri Jul 10 21:18:14 2020
Category      : Instrumentation Service
Description   : Redundancy regained
Redundancy unit: System Board PS Redundancy
Chassis location: Main System Chassis
Previous redundancy state was: Lost

Severity      : Critical
ID            : 1306
Date and Time : Fri Jul 10 21:17:50 2020
Category      : Instrumentation Service
Description   : Redundancy lost
Redundancy unit: System Board PS Redundancy
Chassis location: Main System Chassis
Previous redundancy state was: Normal

Severity      : Ok
ID            : 1304
Date and Time : Fri Jul 10 21:11:34 2020
Category      : Instrumentation Service
Description   : Redundancy regained
Redundancy unit: System Board PS Redundancy
Chassis location: Main System Chassis
Previous redundancy state was: Lost

Severity      : Ok
ID            : 1
Date and Time : Fri Jul 10 21:11:11 2020
Category      : Data Engine
Description   : Log backup created

Severity      : Critical
ID            : 1306
Date and Time : Fri Jul 10 21:11:11 2020
Category      : Instrumentation Service
Description   : Redundancy lost
Redundancy unit: System Board PS Redundancy