Does Elecraft keep a history of each K3 manufactured and the follow on mods? Tracked by serial number? My #250 has been back to the mothership several times for repairs/mods etc. I am not sure if my KXV3 has been changed to the 'A' or not. Thinking about adding the P3 to the lineup and not sure if rig is ready or needs the A mod. 73 Tom CX7TT