boxi31sp3 update install with weblogic..how to use same port

Hi, does any one have any insight/suggestions/workarounds for the below problem.

We have a existing BOXI 3.1sp2 installation with WebLogic on a windows host and would like to update to 3.1sp3, the problem is we do not know the weblogic domain(port 7002) account password which was used in the existing installation. My question is can we recover the password in any manner? OR Does the update works if I delete and re-create web logic domain with the same port?

Looking forward for a response.

thanks

anan