[Elecraft] missing segment in display

[Dale Putnam]

Howdy Don,
   A display, that shows all the segments one time or another, depending on the state or mode, i.e. in cw normal, the bottow segment of the "c" is missing.. but it shows in "u",  has me confused. The soldering has been rechecked, under a 30x glass, on the front panel and control board, and the display has been scrutinized. 
Any guidance or thoughts? 
  How does the display "know" the difference of which mode the radio is in... it would only "know" what the driver tells it?
 
thank you, 

--... ...-- Dale - WC7S in Wy