If you currently have access to the Tax Pro Accounts, there is a place to click that says link my account to CAF.  When I login in now, it appears there is a banner ad that reads "To get started link, your CAF number in your profile."  There will be a link your caf or a link another caf number.  Once you click that, IRS will mail you a letter with a pin number that you have to enter to link the CAF number to your tax pro account.  Once you receive the letter and enter in the pin number, you can see all your POAs in one place and can remove yourself from some.  (I hear some have had errors removing POAs.)  Also it is showing balance due information, but from what I have seen it is not accurate yet.  IRS was working on it at the time.  If you do not have access to Tax Pro accounts, then starting with setting up eservices, but that takes awhile.