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## Verify Rear I/O Module Functionality

1. Verify that the System Service Required LED on the rear I/O module is not lit.

   See Rear I/O Module LEDs.

2. Perform one of the following tasks based on your verification results.

   - If the previous steps did not clear the fault, see Diagnostics Process.

   - If Step 1 indicated that no faults have been detected, then the rear I/O module has been replaced successfully. No further action is required.

##### Related Information

- Rear I/O Module LEDs

- Locate a Faulty Rear I/O Module

- Remove the Rear I/O Module

- Install the Rear I/O Module

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