Agile for a Large Maintenance Team....

Going Agile...

Our whole company goes Agile, indeed a great thing, but I personally feel it as a challenge to change. There are many blockers , sorry, impediments..

a.My team is a very large team - 16 Testers and 10 Developers
b.My team has been split between Chicago and Bangalore (both developers and testers)
c.My project is a legacy project and for every release, we have 75%bug fixes and 25% new functionalities
d.As a typical large, legacy project, we have such a huge(sic) platform matrix , which means, there may be situations, where Developers have lot to code, and
its a easy job to testers, in other hand, sometimes, Developer has less code and tester has to put lot of work. Managing this is challenge
e.Automation is very lesss in this project (duh) and no comments
f.Who could be product owner as none of them 'owns' anything here in bangalore. Real decision maker (Program manager) sits in Chicago.
g.and so on...

Is it worth going scrum??!! How to trim the whole thing..???????

HOW TO GO AGILE FOR A LARGE MAINTENANCE TEAM..anybody there.....???