[Elecraft] Main Ant Port Degraded

[K4PI.Mike Greenway]

Using a K3 I have run into a situation that would appear to be a problem 
in the receiver that maybe someone can give me a clue.  For example, I 
have a 160 M transmit antenna, SWR 1:1, I am receiving signals but they 
are way down in strength compared to my RX antenna port. Background 
noise is 0 db on either Ant 1 or Ant 2 port but signals good via the RX 
port along with several S units of background noise.  Appears to be the 
same on all bands.  I can't think of a setting that might cause this.  
Normally the background noise on the xmit ant is 2 to 3 times stronger 
than the RX ant signals.  Possible lightning damage on both main ant 
ports?  Any thoughts appreciated.  You can mail direct if you like. 
K4PI at comcast.net