Is it necessary to rebind JDBC Type 4 packages when installing a new Fix Pack

[klh]

We just installed DB2 ESE V8 FP12 on our Windows 2003 servers. We also
installed the DB2 ADMCL V8 FP12 on our websphere servers. We use the
JDBC Type 4 drivers on our websphere servers to directly hit our DB2
Z/OS V7 databases.

When we originally set up this environment (DB2 V8 FP8) we had to bind
the JDBC type 4 drivers using the syntax:

java com.ibm.db2.jcc.DB2Binder -url jdbc:db2://(ip address):(port
number)/(system name) -user (userid) -password (pswd) -collection
(collection name) -size 10 -keepdynamic yes

So, I assumed that after installing FP12 I should rebind the JDBC Type
4 packages, however, when I try to run the above statement it fails
saying the packages already exist. After looking on the IBM web site
it appears that there is no provision for being able to run the
DB2binder and replace the existing packages.

My question is:
1) Is it even necessary to rebind these packages? (the readme.txt
files for the FP12 don't mention doing this)
2) If it should be done, do I have to free all of the current packages,
and then rerun the DB2binder? If so, can I identify all of the
packages to free by looking at all the packages under "collection
name"? Or is there a chance that IBM slips some packages in other
locations, besides "collection name" when the DB2binder is run?

Thanks for any insight into this question.
klh