The Custom Code Validation Tool is useful to determine if customizations can be upgraded.
To download the tool, go here: https://www.microsoft.com/en-au/download/details.aspx?id=30151

Click to install:

You will see:

Import the solution:

You will now see the new solution under Solutions. Open it. You may be prompted to provide your Windows credentials. Select Open the CRM 2013 Custom Code Validation Tool:

This window will open. From here if you have any potential issues you will see them:

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