[Elecraft] K3 IF Mod - Is it needed or not?

[K4SC]

I have K3 #3332 which I built in August of last year (I think).  I also have
P3 #302.  I am not sure whether my K3 has the IF output mod already
installed or not.  I believe the transition was September.  Is there anyway
to definitively tell whether or not I have it?  My P3 seems to "see" signals
just fine.  As an example, just now on 40 meters noise seems to be centered
at approximately -115 dbm with my vertical connected and -125 when I switch
to Antenna 2, which is not connected.  Does that sound about where it should
be.  I really do not want to alter the PC board on my K3 for no reason. 
Your comments would be appreciated.  Chuck K4SC.
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