How to import webdynpro JAVA application deployed on SAP Portal

Hi,

I have a web dynpro JAVA application running on SAP portal in which I need to make changes. I have no previous experience of working on SAP portal or webdynpro JAVA. It would be really great if some any one could guide me how to go about the below requirement.

We have webdynpro JAVA application running in Prod in which we need to make some minor changes. How should I go about this requirement

1. Do I need to download webdynpro JAVA component from SAP Portal. If yes how do I do that. I tried navigation system Admin-> support->portal runtime etc. but was not able find the component in question. I also tried server path /Server0/app/com.sap but only thing I found was the java source code.
2. any other option which I should explore so that I can retrieve the production version of the webdynpro application and make changes to it.

I don't have backup of the project in which the webdynpro application was developed.

Awaiting response.

Regards

Soumit