[Elecraft] K2 Performance question

[jacob chambers]

Dear Group;

As I use my beloved K2 - and keep adding options - I wonder...
Since it is a kit, and one I did not build, how can I be sure it is giving the best performance in terms of sensitivity? Is there an easy way to determine if it is giving its all? 
I know a test lab would work, which unfortunately I lack, and I can do some sensitivity comparisons with my other rigs, but short of a full re-alignment is there anything? 

BTW I have no reason to believe it is anything but great!

73;
Jacob K4JQV 
Lexington, KY