I found an instance with the following db2level output:

DB21085I Instance "db2wb" uses DB2 code release "SQL07010" with level
identifier "02030105" and informational tokens "DB2 v7.1.0.28", "s010216" and
"U474808".

But this signature does not match any of the fix pak levels listed on IBM's v7 reference page:
(http://www-306.ibm.com/software/data...ownloadv7.html)

The O/S level is AIX 4.3.3.0 and the DB2 product installed is EE. Does anyone recognize this level of DB2? I need to figure our which download I need to upgrade this to fix pak 13.

That is Fixpack 2a which is no longer listed on the download site. You will need to upgrade to fixpack 3 first to get to the first version of 7.2, before you apply an other later fixpacks. Be sure to follow the install instructions carefully.