Cisco Wireless :: AP-manager Interface On 2504?

I'm getting familiar with an existing, working wireless installation that uses a 2504 controller (recently upgraded to 7.3.101.0).
 
From the documentation, it looks like there should be a "AP-manager" interface by default (static).  There is not one. 

Configuring the Management Interface (GUI) #

Step 1 Choose Controller > Interfaces to open the Interfaces page.
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Figure 3-3     Interfaces Page
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According to that document, there are 4 Static interfaces.  On the one I'm working on, there are only two: "management" and "virtual."  (There are also a couple of "Dynamic" interfaces that have been set up.)From reading the documentation, it sounds like there should be an AP-manager interface, and that this would have been there by default. 
 
It also sounds like an AP-manager interface is needed:Information About the AP-Manager Interface ## A controller has one or more AP-manager interfaces, which are used for all Layer 3 communications between the controller and lightweight access points after the access points have joined the controller. The AP-manager IP address is used as the tunnel source for CAPWAP packets from the controller to the access point and as the destination for CAPWAP packets from the access point to the controller.
  
Question 1:  If I do not have an AP-Manager interface, are the APs connecting at L2?  Is there some way to tell on these controllers whether APs are connecting at L2 or at L3 using udp? 
 
Question 2:  Is it not the case that one AP-manager interface should be there by default?  (I see in the docs that more than one can be created, but in that case I expect that the additional interface(s) would show in the list as "Dynamic" and not "Static.")
 
 A bit of background: The customer network is largely one flat network now, and I'm planning on subnetting it, and routing from the closets up.  I want to make sure what may need to be changed in this wireless setup before proceeding.  (The main wireless users are also getting IP addresses on the same flat network, at this point.  That obviously will change so that they are on their own subnet.)