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## Locate a Faulty Rear I/O Module

The System Service Required LED on the rear I/O module will light when a rear I/O module fault is detected.

1. Determine if the System Service Required LED is lit on the rear I/O module.

   See Rear I/O Module LEDs.

2. Remove the faulty rear I/O module.

   See Remove the Rear I/O Module.

##### Related Information

- Rear I/O Module LEDs

- Remove the Rear I/O Module

- Install the Rear I/O Module

- Verify Rear I/O Module Functionality

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